I don't know, but I do know this happens a lot. I think it is a matter of not making gm the move until you have to. As long as they don't have a need for that roster spot today, there is no need to put schwarber on 60 day. I've seen it with pitchers who have had obvious season ending situations. They go on 60 day eventually, but not immediately, unless they need the spot ASAP.