Palmer - 3rd, has developed into a dependable outside WR. Probably profiles best as a WR2.
Coleman - 2nd, still developing but had a real strong stretch as a rookie. According to Allen, he's added bulk this summer.
Shakir - 5th, has developed into a near elite slot WR.
Moore - 2nd, plagued with poor QB/OCs and stats resemble it. That said, his catch rate and drop rate numbers are solid.
Samuel - 2nd, issues staying healthy but has proven to be a good slot WR and gadget player.
Shenualt - 2nd, hard to say what the issue is, career got off to a good start. Also has good catch and drop rate numbers.