They're no more qualified to make medical calls than the rest of us. The only opinions that really matter here are Joe's, his family, his doctor(s) and Twins management.
For the time being you'll be seeing Rosario in left. What I don't want to see is Arcia flipping his bat over his head after a strikeout. When he's grown up enough, then he can be in the Show again.
Nolasco had a setback throwing his last side session. It's possible (but undecided) if surgery will be needed on the damaged ankle, but it looks like the cortisone treatment was not effective.
Good job, Michael. That's the big picture view. For Byron, even if he doesn't turn out to be Superman (and there's no reason to think he can't), he should still be able to build a fine career as The Flash. And then go mow the lawn afterwards.
I suppose it would be considered bad form here to point out Ockham is actually a place, and that William of Ockham is a friar who had some ideas about logic of evidence. I like bad form sometimes.