I don’t see the Cubs dealing Nico for Castillo. To me that doesn’t make sense. I also understand Woo or Miller shouldn’t be put under proven major league pitcher. I know you want Kirby or Gilbert, which, so would I. But they need to add a solid #2 and maybe a #3 to make that happen. Maybe only one solid prospect if they take back Garver in the deal. That does lower Seattles payroll. In the ideal world I would like to see either Kirby or Gilbert and Garver to the Cubs for Nico+. But what would that plus be? As for Castillo, he is probably better than Tailon, which is something they have said they were looking for. So he does fit the Cubs. I think him for Bellinger lines up pretty well. And again, if the goal for Seattle is lowering their payroll then take Garver back again. I am not really sure anything else has to be added either end that deal. Either deal finishes the rotation and leaves them $30M to $35M to grab a starting bat, a bench at and a pen arm through a trade or free agency. They should be able to do all of that. Getting Garver solves the catcher spot. Higher priced that what I like, but it does eliminate a need.
For me, trading either Nico or Bellinger should not signal that the Cubs opened a spot for a prospect. If they did either deal they would have their rotation in order and their catcher. They would still have $30M to work with to replace that bat they lost, add a pen arm and a bench bat. Very doable. Let all remaining top prospects start in AAA and come up as needed. If they prove themselves maybe then they find a spot for them.