Some nitpicking...
Hutchinson is Beevers' replacement at Millwall, not Upson's. He's a centre half.
Nicky Maynard has had serious knee injuries that have ruined him, it's not really a case of not 'kicking on'. Shame, as he was a top Championship striker.
Paul Downing's not a veteran, he's about 25.
Mark Davies is very likely to leave Bolton although I agree he'll be very good in L1 if he stays.
Billy Clarke is never in a million years Bradford's key player and only scored four goals last season.
I'd say Rochdale are more defined by their attacking intent and playing with freedom than being well drilled, fit, organised etc. They often win convincingly in games you expect them to lose, always post some really eye catching results. Not saying they aren't fit and well organised too though.
I'll add a key player for Peterborough, Chris Forrester. Central midfielder, playmaker, and their captain.
Don't think Simeon Jackson will be Walsall's main man, like Maynard, I think his best days are behind him, albeit for different reasons. I'd have Oztumer as their key man, he's got a lot of ability and they typically get the best out of players like him. Moussa could be a massive asset if he can stay fit. The same could even be said of Cuvelier. They've gambled signing those three, that's for sure.
They lost Anthony Forde who's a winger, David Forde is the keeper.
I'd definitely expect Lyle Taylor to be Wimbledon's key player, I think he'll do well in L1.
I'd have Anthony Grant as Vale's key player if he stays.
Overall I think your predictions are fairly logical, although I think Peterborough will be a fair bit higher than 14th, they've got a good squad. I'll post some of my predictions on this thread, because I know you'll bump it at the end of the season.