As a Cubs fan I could easily part with Baez, Almora and Vogelbach in any combination. No way the rest of the big bats should be traded. But, there is now depth in the system. There might be a team out there drooling over Gleybar Torres (I am a little already). The organization has the chance to develop Schwarber because of three guys in the system that can probably catch a little at the MLB level. Any one of those guys is attractive to the right team.
I love Torres, but I doubt there's a team drooling over an A ball player, no matter how good a season he's having. You would be selling very low on Torres if you traded him now.
The org can part with Baez, Almoral, Vogs, the question is how much do they bring back in return. Baez needs to prove the lower K rate is real and he can hit at the ML level, not just experiencing a hot streak in AAA. Vogs is a DH, below avg 1B, so you are limited in teams who will take him. Plus, he pulled a hammy in today's game, so he's probably not going anywhere for a while. Almora can't hit. Ok, he's got a nice glove for a CF, but he's struggling hitting in AA. This is not going to bring much in a trade.
My hope is Baez gets called up in mid June and then shows he can be productive at the ML level. Then you can trade either Castro (and you pray he starts to get hot with the bat) or Baez for a pitcher. I don't even care if they trade one of those guys this season, but they'll need to trade one during the offseason, and hopefully for a pitcher.
Schwarber probably has the most trade value but I'm reluctant to trade him now because if he can even play part-time as catcher, his value could be tremendous. If he can't stick at catcher he still gives you tremendous value in LF. People are freakin' crazy talking about moving Bryant off of 3B. He's literally league avg (13th) in defense according to Fangraphs. Very nice for a 23 year old rookie, who's main problem is throwing the ball on slow choppers. He has a bad habit that needs to be corrected, but can easily be corrected and Bryant could then be a slightly above avg 3B. With his huge bat at 3B, this gives the Cubs tremendous competitive advantage over other teams. Keep him at 3B, he's a very good athlete.