WWI Dardanelles Campaign POD?

I came across this interesting answer on Quora the other day, and thought it posed an excellent POD:

Murathan Kale said:
A Turkish artilleryman lifts a 258 kilogram shell singlehanded for loading in a cannon. Corporal Seyit (Seyit Onbasi) is famous for having carried three 275 kg shells to an artillery gun during the Allied attempt to force the Dardanelles on 18 March 1915. Born in a the village of Havran, he enlisted into the army in April 1909. After serving in the Balkan Wars of 1912-1913 he was transferred to the forts defending the Mediterranean entrance to the Dardanelles. Following the heavy naval bombardment of the forts guarding the Narrows on 18 March 1915, the gun he was serving in the Mecidiye fort remained operational but its shell crane had been damaged. Seyit carried three 275 kg artillery shells up to the gun enabling it to continue firing on the attacking Allied fleet. One of the shells reputedly hit the British pre-dreadnought HMS Ocean, most probably contributing greatly to the repulse of the Allied naval assault.

442px-Seyid_Onbashi.jpg

After that Seyid was promoted to corporal and publicised as an iconic Turkish hero. He was discharged in 1918 and became a forester and later coal-miner. He took the surname Çabuk in 1934 with the passing of the Surname Law. He died of a lung disease in 1939. A statue of him carrying a shell was erected in 1992, just south of Kilitbahir Castle on the Gallipoli Peninsula.

P.S. There are some skeptics who think that this story might have been invented for propaganda reasons. First of all, the Ottomans were not as sophisticated as the Allies or the USA regrading propaganda strategies. When it comes to propaganda, misinformation and psychological tactics for manipulating the masses the Western countries are way ahead of the Turks. Secondly, the only eye witnesses were the few soldiers operating the gun. Nevertheless, according to military records, the crane of the canon was broken and the rounds fired. The battleship Ocean was hit by a cannon shell exactly at a position where it was facing this particular fort.

So two questions:
-What is the reasonableness of this single individual simply being sick, hurt, or otherwise absent and unable to perform the feats he did; resulting in the HMS Ocean remaining in the battle?

-And if the HMS Ocean did indeed stay in the fight, would the addition of this ship have been enough to significantly alter the outcome of the March 18th battle? And from there, the larger Dardanelles Campaign?
 
The problem with this is that the course of events described in the Quora answer doesn't well describe the events of March 18th. The Allied fleet had entered the Dardanelles at about 10:30 am on the 18th. They saw some success, but at about 2 pm, the French Bouvet struck a mine and sank. Firing continued, with what seems like good effect, but at 4:11 and 4:15, Inflexible and Irresistible both struck mines, from the same field as Bouvet struck. Inflexible survived, but Irresistible began to drift uncontrollably. At 5 pm, the Allied fleet withdrew, thanks to the perceived threat of mines, but Ocean was sent back to assist Irresistible. Here, she did come under heavy fire, but most British sources don't mention her taking serious damage. At the same time, this is overshadowed by the fact that she struck a mine, again from the same field, shortly afterwards. Ocean's sinking occurred well after the Allied fleet had withdrawn, and in any case, Admiral de Roebeck's decision to withdraw did not result from the efficacy of Ottoman gunfire, but from mines.

There are a few good PODs that could be used for the March 18th attack - for example, British minesweepers discovered the line of mines following Bouvet's sinking, but this was not reported to de Roebeck until after the British ships struck the line. Had these mines been reported, then de Roebeck might have persisted in his attacks on the Dardanelles. Arthur Marder suggests another POD. In the weeks after the 18th, the RN equipped a number of destroyers with sweeping equipment. These could have been used to sweep the mines in the narrows without suppressing the forts, but de Roebeck was unwilling to do so, and prefer to land troops rather than taking the risk. Had de Roebeck's deputy, the more confident Keyes, taken control, Marder suggests that attack would have been carried out, and might have succeeded.
 
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