It’s all about fine margins though. Another 3 points would have got us into the play-offs. Before his concussion at Rochdale, Murphy had been earning MoMs for key saves that kept us ahead or earned us a point. Doohan did that less. I’m trying to think of games where he did make a difference with crucial saves and there weren’t that many. Harder to factor in is Murphy’s distribution being better, but on detailed analysis you’d expect that to make a difference too.
While you’re right that a number of factors were responsible for our slide down the table this year, last season suggested Murphy was the better keeper. The fact that MM stuck with Doohan for such a long period despite that impression is down to Micky. Ultimately our failure to make at least the play-offs falls on the manager’s shoulders.
Doohan was solid in his positioning and handling for several months and had a superb clean sheet record, as has been pointed out above. I don't recall him making countless worldies, but I also don't remember any clangers either with the possible exception of the Northampton game. However, in that match the performance of the back four was abysmal and we offered zero creativity until the last fifteen minutes. We would have lost whoever had been in goal.
So in answer to your point, I can't remember a single occasion where Doohan alone cost us the three points which would have got us into the play offs. If we are singling out individuals, perhaps we should (unfairly) focus on Clarke's errors at Walsall and Hartlepool ?
Murphy is the better keeper at the present time. However, his performance against Cheltenham the season before last was worse than any Doohan produced, if we are trading bloopers.
I personally don't think Doohan's presence or absence had any material impact on our promotion chances. If Murphy had played every game last season we still would not have gone up, due to the other deficiencies highlighted above.