I don't think many people will agree with me, but I would say Jim Bentley.
Morecambe looked doomed coming into the season. They lost almost all of their best players for nothing and had a very small budget to replace them. They started the season with a squad that looked very poor (And after finishing last season in such terrible form). I think the Morecambe players went three months without pay at one stage this season and the club looked in turmoil with an absent owner. In January they were unable to sign players due to an embargo. They lost one of their better loanees and their star player moved to Preston, yet despite all this Jim Bentley's had them well clear of the drop all season. Okay, they're 18th now and could even finish 21st, but Bentley has pulled off a miracle to keep that side up.
Don't get me wrong, Adams has done a very, very good job. But that doesn't compare to pulling off a miracle for me.