I'm down with that. The issue I have is that most of the trades people talk about for him around here dont seem like a legit possibility. It does not make sense to me for the Mariners to take on Bellinger. Yes, he plays 1B and they can use him there to upgrade the defense over Raley and use Raley as the guy who bounces around the OF and gives Bellinger a breather every so often, but the problem is the dollars.
The Mariners are working with 1/3 of the money we are talking about the Cubs have. If the Mariners would do Castillo + Garver for Bellinger then I would do it. That probably equals out in value. But do I think the Mariners are interested in losing Castillo to go from Raley to Bellinger? Absolutely not. They wash on money, get out from at least 1-2 years of Castillo's money, but have to replace Castillo and find a new backup catcher with the same lack of funding you had to start with, oh and by the way you still have to find a 2B and 3B and BP.
It's probably why the rumor around the Cubs and Mariners discussing Cody Bellinger hasn't been as hyped out of Mariners camp as the rumor around Nico Hoerner. Hoerner gives them money savings and the best player in deal by a pretty decent margin. I wouldn't at all be surprised if the Bellinger discussion lasted like 10 minutes of brain storming before it was scrapped. If I was them and I was told Bellinger has to be involved then I would just keep Castillo for the year and then trade him next year when his NTC is gone and he has no power at the table.