Wylie had some stuff pre-surgery a few years ago, but right now he isn't much of a prospect. Ginter has much better stuff and I still believe Ginter becomes a sucessful reliever at some point, the question is with the Sox or with another team.
As far as Rauch he's got a great curve and the question is whether he can get his slider to the point it was before the surgery, if he can do that and mix in his improving changeup and fastball, which would then be sneaky quick, then he will be sucessful. If he can't, then he'll be a mediocre player but still a big leaguer, most likely with another organization.
This is definately his last year in the minors with the Sox. The Sox can't call him up unless they think he's gonna stick cause if I recall he's out of options.