Feeley will be fine; you'll see, he'll be just fine - no one will ask him to set the world on fire or be the next Marino, he'll just be asked to play within himself. And once he realizes that he has the talent and arm to do that, he'll be fine - and he'll get better as the season wears on.
No, the one I think warrants concern is Chambers. He has not risen above his circumstances on a consistent basis EVER. And please, spare me the apologist crap about not having a good QB, a good system - all true, but it hasn't stopped other WR's on bad teams, with bad QB's, and bad systems, from rising to the challenge and exceling. Look at David Boston in Arizona as one example close to home.
Chambers drops easily catchable balls, he doesn't run the routes he's capable of running - and worst of all, he doesn't seem to give 100% on every play - something that Saban absolutely will not tolerate. It all adds up to unforgivable behavior on the part of an individual who has the ability to be among league leaders at his pisition. And it's all on him, because despite the circumstances that surround us, the one thing we can always control is how we react to them.
My prediction - make a note, so at season's end you can beat me over the head with it, or congratulate me on my insight: we will go into next year's draft with Wide Receiver as our number one need, because Chambers will at last - with no built-in, ready-made excuses to rely on - prove what I have been saying about him for two years now: that he is unworthy of being the #1 receiver on this team. He is at best a #2 receiver, a good complement to a go-to guy.