I think we're getting a little hyperbolic here. Not great that hes not playing this year, obviously. 7 days ago people were anointing him as the starter next year lol. This is a continuation of his injury from last year, guessing they tried to let a labrum heal on its own, its bothering him, in order to hit the ground running in January at ND he decided to get it repaired now.
Comparison to Buchner is nonsense outside of limited snaps. TB was an athlete trying to play QB while Monds is a QB with athleticism.