Its about ready and broken in backups that the player is comfortable with in the event a glove breaks or is lost, not anything to do with different gloves for different uses at the same position. They have backups for the positions they play regularly....likely more quantity of backups for the positions they play most frequently.
Robert Kraft said publicly in the last year or so that Mayo was the heir apparent. This has been a done deal for quite a while. Nobody else was getting that job.
It's an attempt to create a story leading up to the game; a story that hopefully generates questions for UM players and coaches, and potentially offers some distraction from the task at hand. Nothing more.
While that may end up happening, Curran's report that the Tweet/graphic is based on was him speculating after the Germany game. He made it very clear during his original info on this that he thought that was what was happening, not that he was told it is happening.
It all boils down to how his patience and strike zone knowledge translates when pitchers are throwing more strikes than he's ever seen, and better quality strikes at that. Does the strikeout rate spike and power dip because he's still trying to wait out pitchers, or did he adjust and swing more at pitches he can drive?
The problem is his stuff had been that volatile since he was on the prospect radar. You could see home one start in HS and he'd be electric and the next he was completely ordinary.