Apologies, I should have clarified what I thought was where. According to my sources at Kingisepp I have 191st Rifle Division Deployed to Kingisepp, fighting around bridgehead at some point, eventually subordinated to Kingisepp Operational Group. Based off your sources it may have originally been fighting further west before moving to XLI Corp's bridgehead. 90th Rifle Division fought in the area of the bridgehead and was eventually attached to the 2nd Luga Operational Group. 118th covered the approaches to Kingisepp and was also involved in battles around the bridgehead. Information is sketchy, but it was definitely involved in combat in July. Along with that are two PM rifle divisions, with more available for combat.
So for 14th-15th July the Red Army OOB at Kingisepp was:
191st Rifle Division
90th Rifle Division
118th Rifle Division
2nd DNO (With an attached tank battalion)
4th DNO
1st/3rd DNO in reserve
Various training schools and separate artillery units
Like I said the 90th is of dubious combat value and to the north. It wasn't able to counterattack until August 8th.
The 191st is recently arrived and to the south and not in a position to launch a counterattack or block an advance to Leningrad.
The 118th I don't know anything about. I'll have to do some digging on it's strength and positioning. Now that I know that it might be there I think know where to look for it.
The militia can't block an advance. Contain a bridgehead, sure. Block an advance? No.
For reserves, 1st Tank Division was attatched to the Karelian Front (Did not take part in fighting with 1st Mechanized Corps) and shifted south in mid July to form part of Voroshilov's reserves, as were the four rifle divisions. Apparently they were in the region for deployment 15-17th July.
Did not know that about the 1st Tank division, checked through some sources and you're correct (at least partially) I thought it got mauled with the rest of the 1st mech corps. Most of it left Karelia, two tank battalions and it's motorised rifle regiment was left behind and formed an independent tank brigade later. But the problem is that the division was fighting in the Salla region, that is way up north, it has no chance of reaching Leingrad in time as from my understanding the order to redeploy to Leningrad was given on July 17th (of course since my Russian sucks worse then google translat it very well be that it's commanding officer where having a birthday party on the 17th). On the 23rd I have it assembling south of Leningrad near the town of Gatchina 45km south of Leningrad. The question then is, when is it at Leningrad? 22nd? 21st? 20th?
The XLI Corp's decision to halt at the Luga bridgehead came only after a week of stalemated fighting against 2nd DNO, it's attatched tank battalion, and elements of various other Soviet units. While the People's militia divisions were certainly weak, they weren't useless, as shown by 2nd DNO's ability to contain Reinhardt's bridgehead. XLI Corps attempted to do so several times in order to link up with LVI Corps in accordance with OKH's original directive to encircle Soviet forces along the Luga. But it failed to expand its bridgehead in order to stage a major advance.
Containing a bridgehead is not the same as stopping an offensive from a Panzer Korps. And my sources say the advance stopped prior to Soviet forces arriving to contain the bridgehead for the reasons I've given.
With the support of 25th panzer and 5th Light it certainly could do so, but this assumes that both divisions can be deployed quickly into the bridgehead. XLI Corps only controlled two bridges, and took several days to bring up elements of two divisions to support the bridgehead. Adding in two extra divisions will create a further traffic jam which will delay German forces forming up to exploit from the bridgehead. At best XLI/DAK will be across the river in force for an exploitation by 17th-18th July. By then the Red Army will have concentrated at least 3, possibly 4, rifle divisions against the bridgehead, backed up by the Luga Defense Line which extended 10 kilometers back from the river.
I agree with the first part, that the it would take time to sort out any problems, but not with the second part, that the enough Soviet forces had arrived by then to block an advance by a full Panzer Korps. You have a weak 90th and the better off 191st, on each side but not directly in between and the possible 118th at an unknown location. Both the 90th and 191st are unable to block an advance due to their positioning. The 118th I don't know much about, I have it attached to the 8th Army (part of the Leningrad front) which is split in between Estonia and north of Leningrad, but no location as to the divisions exact whereabouts on August 1st. And nothing between that and June 22nd. From I can gather the 8th army or any of it's units was in any position to block an advance on Leningrad from the southwest.
Following the Luga Defense Line are several more belts extending back to Leningrad. These will be defended either by Soviet reserves or People's Militia formed in Leningrad which IOTL proved effective at defending from fortifications. XLI/DAK also have to contend with the terrain of the region which is unaccommodating to rapid exploitation against strong resistance. Further, the Red Army still has 4 reserve Rifle Divisions and 1 Tank Division to repel an attempted exploitation towards Leningrad.
The soviet militia were able to check a corps not set on advance and without it receiving much in the form of supplies due to facts I stated earlier, which won't be a problem here. The tank division if we're talking about the 1st it isn't there yet, it only arrives on the 22nd/23rd. What four rifle divisions? I don't have any nearby, the 272nd, 265th, 268th, and 281st you mentioned earlier?
The 268th was part of the 8th army as well, so same thing applies as with the 118th.
The other three were units in reserve, but I have nothing as to their locations. And nothing that indicates they were south of Leningrad or in the city itself. All I have is that they are diverted north to halt the Finnish advance from the north on the Karelian isthmus. So it seems to me like robbing Peter to pay Paul, either divert them south to try and halt Reinhardt, which might succeed long enough due to the logistical chain and have the Finns cripple the northern defense and other forces will have to be diverted there. Or leave the door open for Reinhardt.
At best XLI/DAK will unhinge the Luga line and force a Soviet withdrawal before having to halt due to logistics and Soviet resistance. The net result is a more consolidated Soviet defense and the loss of a German opportunity to encircle Soviet forces around Luga as they did IOTL in August.
I disagree, between the 15th and 20th the Soviet defenses south of Leningrad is wide open without any organised forces between the city and the Germans. The Soviet were scrambling for reinforcements true, but could they get there in time to halt an advance on Leningrad? Maybe, maybe not hard to really tell as there's quite a few factors involved.
Now overall I must say I've enjoyed this discussion, great fun

But I don't have the time to dig through a shitload of various sources like this, so I'm just going to ask: Given everything both you and I've dug up do you still consider it ASB for the XLI. Pz.-A.K. To take Leningrad sometime the 18th-20th July? Does it require magic, aliens, time-travel? I'm not asking if you consider it likely or even remotely likely, but is it ASB or is it within the reason of possibility?