QB would presumably be Eli Taylor, he's been doing the 7 on 7's and he throws a nice ball. Carter Black and Jackson Wininger were the JV QB, so there could certainly be some competition for the #1 spot. All 3 will be Jr this fall. Chris Martin is too valuable as an all around player to be limited to the QB spot. He'll be a S on D and a WR/RB on O. He'll also continue to be the P. (He's the Swiss Army knife of the team, aka the Deuce 2.0)
I think there will be a couple of new key contributors that could be used on the DL or OL. #67 Dorian Vance 5'10" 225 lb Jr and #34 Dontay Davis 5'9" 198lb Jr. On the OL we have returning Jr starters, C Jackson Bryie and T Marvin Fields.
I think Coen Logan So CB and Bryson Fraction Jr S will be big additions in the D backfield.
These are just initial observations from what we had last year moving up, and I haven't seen who's making progress in the weight room. There's a lot of spots open on the OL/DL where guys will have to step up and make big contributions.