Currently, Darrell Bevel, Jay Hill, and one of the 3 active LDS D1 coaches.
Personally I would think BYU's list would be the following
Most likely candidates:
Darrell Bevel
Jay Hill
Bronco
Ken N.
Paul Peterson
Kellen Moore
Backups include:
Lance Anderson
Shaun Nua
Vic So'oto
Jason Beck
Rober Anae
Yewt Options:
Morgan Scalley
Kyle Whittingham
I apologize for anyone I missed in the process.