Why even bother with Castillo (drewski adds: right now)? I dont think it makes sense for Sea nor Boston to engage in these trades right now. While Harmony does seem to underrate the trade values of Bos players/prospects, I do think he is correct that Castillo's value is likely to rise once the remaining top 2 FA pitchers come off the board.
Y'all know how this works. The Orioles, Yankees, Giants, Blue Jays, Mets, and Im sure a couple dark horse teams are in on the remaining 2 starters. Those that miss out will look to the next tier down, but also the trade market. At this point, when "signing an equiv starter for just cash" is no longer an option, the trade values of Crochet and Castillo will rise (maybe not as much for Castillo if you lump him in with Eovaldi and not Fried/Burnes), but yes it should still go up somewhat.
Its not crazy to suggest that due to supply/demand, teams will have to "overpay" per BTV for a trade for a starter.
If the Orioles get Burnes and the Yankees get Fried and the mets trade for crochet, you better believe the sox will be looking to make an overpay on the trade front. I dont know about Mayer for Castillo level overpay, but certainly some kind of overpay.
SO it makes sense for teams looking to deal a starter to wait (for me). Regarding the Sox, also wait. Lets see if we get Soto. If not, they will make a strong push for Fried and/or Burnes and may land one. So lets see where the dust settles with the free agents before engaging Seattle in a trade.