Yeah, it's hard to say what the White Sox will do. And I'm sure they want to maximize the return as best they can. The Nats-Padres Soto deal is probably the baseline. But they'll never get that kind of return for Crochet. Not even A.J. Preller is that aggressive.
If I were the Sox, I would be considering each trade offer on its own merits, and not necessarily chasing uber-prospects. It's impossible to compare to a thousand hypothetical trades, but if they received an offer that had Ashby and Frelick as a starting point, I think the value, for the Sox, is that firstly, they'd have two MLB players (they have to field a team). Secondly, those players would likely maintain trade value down the road a season or two. If the Brewers started with Ashby and Frelick, and added Luke Adams and one of the 20 year old pitchers, that would be enticing. The Sox don't ONLY need top prospects... they need prospect depth, too. As a franchise, they may be better off getting 4 regular big-league players than trying to find one MVP/Ace.