Man, it's way early, and a LOT of unknowns, like whether Jennings shifts from WR to S and whether Croom shifts to TE, but here's one possible 2016 look:
QB: Guarantano likely to RS. Dobbs undoubted starter. Let the Dormady-Jones backup competition begin again! I think Quentin has the head start.
RB: No question here unless someone leaves.
WR: Any of the six listed could be "starters" or "backups," wouldn't put too much effort into trying to distinguish among those for now.
OL: Will Richmond overtake Kendrick for the starting spot? How about Wiesman vs. Jones at G? And who backs up Thomas at C?
DL: Like the WRs, wouldn't put too much weight on "starter" vs "backup" this early, but think the key players are listed.
LB: Huge questions here, biggest of the two-deep. Who would take JRM's spot if he goes pro? And who gets tagged as 2nd string MLB? The answers to those two questions will be keys to our 2016 success.
DB: We're surprisingly fine here, even if Cam goes early to the NFL. Credit the growth of Abernathy, Foreman, and Moseley as 2015 played out.
ST: I think we see Zac Jancek take Pat Ashford's place as holder, and Riley Lovingood take over for Matt Giampapa at LS. Otherwise, 2016 will look a lot like 2015 on special teams, hopefully with similar successes.
Go Vols!
EDIT: Just noticed one mistake, I didn't update the TE position. Replace graduating senior Alex Ellis as backup with either Jakob Johnson, Joe Stocstill, Eli Wolf, or Neiko Creamer (spring camp will tell us which, maybe).