Tannenbaum has told rex to get vlad in. Tanny is scrambling for his job here. Vlad sitting on the bench is admitting that tanny has wasted a high pick on another bust.The Ducasse/Slauson rotation at LG has shown us that the coaches don't have total control over who plays and who doesn't.
Sanchez playing, duccasee playing etc is all a ploy for tanny to keep his job. Rex knows hes canned if tanny is gone.