Not sure how to think about Schwarber. Had a really good 2nd half. If he could hit like that for the next 5 years, you've got a really valuable run producer, defense regardless.
I assume Theo/Hoyer and other potential trade partners have the same question: will Schwarber future be the 2nd half .997-OPS 2nd half guy who batted .280? Or the .777 first half guy with the .227 batting average? Or the .871 composite guy with the .250 batting average? Or last year's .235-.832 guy?
If Theo anticipates 2nd-half but nobody else does, he won't get offers that he perceived as fair value in trade, and Kyle is back for sure. If other teams project 2nd-half masher, but Theo doesn't, then somebody should make an offer that Theo views as good value. If other teams and Theo have matching valuation, then a fair-value offer might be possible, and a trade might be made, since Schwarber seems to have the game-plannable vulnerabilities that typify the lineup. Obviously that is too simplistic; nobody is going to be super confident that 2nd-half Kyle will project future, but there is calculated hope/risk that he might.
My feeling is to keep him, and hope that 2nd-half Kyle wasn't all fluke. Obviously nobody's going to anticipate that he's ever going to BABIP at .320 again, like Ron's article said he did late in the season. Or hit .280, as he did over the last 70 games. Making a conservative projection on Schwarber, and trading him for conservatively-fair-value return, is not going to help us catch up to the top teams.
So I'd favor taking a shot that Schwarber will be able to hit ≥.250 into the future, and might be a >.870-OPS guy going forward. Maybe even a >.900 OPS guy.