it would certainly be a grey area, and it could most certainly lead to legal challenges (and definitely a grievance from the mlb players association), but do you think clubs are factoring in vaccination when making their decisions on taxi squads, player recalls and player contract selections? in other words, being vaccinated helps give you the inside track on a promotion from the alternate training site. i know that no club would admit to doing this, but they are going to know who's vaccinated and who isn't.