I don't understand the notion that Casty at 20 mill per year or 40 mill total for two years is untradeable but folks wanting to give up high level prospects for Bellinger. If Bellinger is tradable at 53 million over the next two years, then Casty certainly has value. I think in Casty case his value is more to the Phillies than they can muster in a trade but he still has value. I keep seeing he is untradable. I am sure the Yankees would love to have him for two pieces of string and a worn out baseball. Which is what they are trying to trade for Bellinger. Because the Cubs backed themselves into a corner. Trading for Tucker before having a deal in place for Bellinger took away their negotiating power. They don't have a place for Bellinger unless they put him at 1st base. Heck they really don't have a place for Suzuki either unless he DH's. Which he has said he does not want to do.
Once the Bellinger trade happens and it may not be to the Yankees at this point. I think it will open up more reasonable options to trade for outfield wise. Not having to give up 2 to 3 of your top 10 prospects for a 1 year rental.