This is mostly thinking with my fingers, cause I wanted to see the end result if they did trade with an intent of extending Tucker.
Let's say that it's Busch that goes out, I see the Paredes fit but given the very real interest in Bregman and how him going to the Astros seems to make this more likely, that seems favored on the Astros side. Call the final package Busch, Caissie, Wesneski. Let's assume Tucker is extending at 35M AAV, that might end up slightly conservative but not beyond budget margin for error anyway.
We previously assumed the team had 40ish million to spend, and was looking to add C, SP, RP. They now have 5 million and need all those things plus 1B/DH, so Bellinger obviously has to go. I don't see a clean way that his return can solve for one of the 4 spots needing filled, so let's say wherever he goes is for prospect capital that makes other trades easier. Now you have 33 million.
First up is catcher, since it seems clear Kelly is at the finish line. Call it 9 million AAV to be conservative since he's one of the last ones standing. 24 million for SP, RP, 1B.
Reliever now. They were linked with Finnegan, and he seems like a decent fit for this scenario as someone who won't break the bank but has the stuff and pedigree to qualify as the leverage relief add. Call it 8 million AAV, 16 million for SP and 1B.
Now is when you have to decide on the trade option, because you're not doing both of those in a satisfactory way on 16 million, and in FA probably not SP alone. Maybe you make a run at Cease or King since SD has to cut payroll and they're 1 year options in range? That also requires a 1B option that isn't late arb or FA. King + Yandy Diaz is very close(especially if our FA/Tucker estimates were at all high) but requires a lot of trade assets and would require ever more creativity next year with both King and Yandy being FA. Just a very narrow road.