I'm going to predict the fall position battles. Bold is who I think will win.
Starting Left Tackle:
McDermott, Brown, St Louis, Herbert, Hillery (I think they will allow him to compete, but red shirt him if he doesn't win starting job).
Backup LT:
Darling, Brown, Herbert, Tre Johnson, St Louis
Starting Left Guard:
Darling, Milo, Mahoney, Linder, Ryan Fines
Backup Left Guard:
Milo, Mahoney, Linder, Tre Johnson, Zach Dykstra, Ryan Fines ( I think Dykstra could see rotational play at OG if he develops enough over the spring, will most likely redshirt though)
Starting Center:
Gauthier, Linder, Gaynor, Milo
Backup Center:
Linder, Gaynor, Milo, Mahoney
Starting Right Guard:
Mahoney, Donaldson, Jahair Jones, Milo, Ryan Fines
Backup Right Guard:
St Louis, Mahoney, Milo, Jones, Dykstra, Ryan Fines
Starting Right Tackle:
Odogwu, St Louis, Donaldson
Backup Right Tackle:
St Louis or Odogwu
TL;DR
Starters:
LT: McDermott
LG: Darling
OC: Gauthier
RG: Donaldson
RT: Odogwu (If 100% healthy)
Rotational players:
LT: Brown
OC: Linder
RT: St Louis
This year we used a 7-man rotation, I think we use an 8 man rotation this year, with all the freshman OL except Donaldson red shirting.