I don't get where the love for Schweinsteiger comes from, purely from a footballing perspective but it's generated because he's good with the fans, has a social media presence and probably is an all-round good bloke.
However, his behaviour (never mind his football) is questionable. He came in and had an opportunity to really cement himself within the fabric of the team with his leadership skills and role-model ability yet when he was injured and because of his cosy relationship with LVG, he was able to saunter off across Europe to support his girlfriend whilst supposed to be undergoing rehabilitation. Yes, he - alongside many others - was constrained in Van Gaal's football but if you're Mourinho hearing all this from the outside, and you don't see he will be fit enough to contribute as he could be injured for most of the season, you already have enough numbers in midfield then you can understand why he wants to let him go. But Schweinsteiger being banished to the reserves, again, it's down to training requirements. If he has 22 players, why should he include Schweinsteiger just for public relations or because of what he's done in the past? Anyway, is he supposed to carry the bibs as he can't be involved in the training?
Mourinho seems to have met all the players individually so I'm sure unlike LVG, he's given him the respect by telling him face-to-face rather than demoting him without an explanation. If Schweinsteiger doesn't go, then he's got a chance to prove Mourinho by working diligently and waiting for an opportunity in the first team which is unlikely as Jose's injury record is fairly good.