None of the eastern deployment plans in the years leading up to 1913 had the Germans taking any lines from AH. They were all about mobilisation of up to 4 armies with up to 43 divisions in East Prussia. 3 or these armies would advance to engage 2 Russian armies, which they would no doubt defeat, and capture fortresses. Once this is done you have 4 armies sitting around in poland at the end of their logistical thether do little to nothing for a few weeks at least. This is not a good campaign plan.
... regarding the plan we know of.
Of these I would like to remind, that for the mobilization-period 1913/1914, valid from 1st April 1913 onwards having to be 'compiled' at the change 1912/1913, included only a short 'study' for an 'Aufmarsch II' or 'Great East Deployment' of its content we don't know.
The last 'elaborated' deployment plan for the East was made for the mobilization-period 1912/1913, valid from 1st April 1912 onwards having to be 'compiled' at the change 1911/1912 latest Jan/Feb 1912. ... with the knowledge of railroads availability and capacity of midth 1911 the lastest.
However, between 1911 and 1913/1914 IOTL there was already quite lot of railway construction - mostly private - going on aside improving the existing lines as 'doubling' as we know it :
- a small-gauge network from Pilkallen east and northeastwards between Schrwindt and the Njemen/Memel
- a line surrounding the Rominten-forrest from Goldap to Szittkenmen to Tolmingkennen, in 1914 the part between Goldap and Szittkenmen yet unfinished
- a small-gauge line from Marggrabowa to the russian border at Filipowo
- a rail-line from Marggrabowa to the russian border at Raczki
- a line from Lyck to the russian border at Raygrod/Raygrod-lake and Borzymimen (IOTL in 1914 partly finished)
- a line from Lyck inwards to the training range/garrison at Arys (IOTL almost finished at the outbreak of war)
This was done in IOTL without a different CGGS, who might have had a different 'attitude' towards the East, what mioght have (rather likely) have caused an more thoroigh railroad construction as what actually happened alread IOTL.
Thereby facilitating ... different operational possibilitieas and opportunities as the ones we know off were contemplated under Moltke the Minors reign at the Königsplatz.
And such 'ideas' aren't IMHO too far flung.
According to v.Kuhl in his afterwar writing about the GGS work during the war he mentioned - regarding prewar preparations - a staff-ride by Schlieffen in 1901 in East Prussia, when he played a 'variant' for the
defense of East-Prussia :
-an attack towards Byialistock, threatening the important russian rail-line leading to Warsaw
(pls note : 'defense', not thought off as a genuine and more general offense)
During his reign of army inspector of the region from 1907 onwards - then army-district VI - Colmar v.d. Goltz exercised the same (with then I.Corps commander v.Kluck following him in command btw) (
from the biography of v.d.Goltz of Herrmann Teske).
In both cases it was concluded, that for a 'sustained' success after having reached foirst objectives - rupture/capture of the railway-knot Byialistock - the forces would be too few. ... with the forces involved only of the according inspectorate-area.
Last but not least I would like to feature - once abain - good old v.Staabs. In his book(let) about an even after Kaiser Bills switch-of-mind of 1st August afternoon by him thought possible 'Deployment on two Fronts' offeres as part of 'his' proposal a german army in Silesia with a general direction of attack/operations towards Lodz and Iwangorod (
what could also be 'interpreted' as a 'austrian-flnak-securing' measure).
As most of the records of the GGS are gone we can't crosscheck if there were similar ideas recorded as well, but v.Staabs didn't live in isolation. Some of his 'ideas' he most likely has drawn from a 'discussion-pool' within the officers-corps.
Therefore with another CGGS following Schlieffen I would render a more ... 'elaborate' and inspired "Aufmarsch II/Großer Ostaufmarsch" than what came from Moltke the Minor alongside a more intense at least railroad-building in East-Prussia very likely.