It was an odd decision by Gleyber to demand to stay at 2b because if he had shown he could play 3rd he'd have increased his FA value big time. Everyone needs 3Bs, but most teams have a glut of IF prospects that can hit but have to move off 3B or SS for lack of arm strength and so have a log jam of 2Bs (like the Tigers). Gleyber came up as a SS, so at least at one point he had a arm that probably could have handled 3rd. Maybe it's gone and he knows it.