Yes, I don't think all of them will get in by any means.
Nyheim Hines had 2 punt return TDs late last year and looked great in the role (I think Reich always envisioned him there, but he had some drops early on his rookie year and lost his chance until late last year). He led the NFL in punt return TDs and was not our primary punt returner all year. If he gets off to a start like he finished last year, he's got a shot at getting in.
If we start winning games and Rock Ya-Sin develops into a shutdown corner, fans will vote for him. He's got one of the coolest names in football and I'm sure Berman and crew will come up with some catchy phrase around it to make him popular.
Mathis just said in an interview he believed Turay will be the NFL sack king within 1-2 years. If that's the case, he's got a great shot. Plus, also has a great name which helps with fan popularity.
I agree with you, it's highly unlikely Willis will make it to a probowl. Also Walker.
If our pass rush improves significantly, I could see Hooker having a big INT year.
You are also right about the RB competition. That said, if Mack puts up a monster year, which I think he can do behind this line, he certainly has a shot. The fact that Brian Baldinger does a special on Big Q every week will help Mack, because the more people hear "Marlon Mack runs for big yards behind big Q" the more popular of a name his will become.
That's why I have a hard time seeing the Colts picking him so early. I think we have more pressing needs right now than safety. We are trying to win it this year. I think the 1st two picks will probably be offense with players with the skill and attributes to contribute right away.