It is good to have options. But where this team is, you keep the guys you think can be stars and trade guys on the next tier.
I don't think Yorke is the centerpiece of a trade for a #1/#2 starter - but he does have value as a near ML-ready regular, and with all of that team control. To me, Bleis is the one to trade simply because he is so far away - just a wider range of outcomes. But he might make a leap this year, his Statcast numbers are promising.
And obviously Zanetello is a wild card - the sort of elite, elite traits and tools which could rocket through the system ...
I do think the team is serious in the trade market. As far as FAs go, who knows - the top guys are all Boras dudes, so nobody is going to learn anything for a while one way or the other.