If I were in charge of this team, I would absolutely be trying to turn him into a starter, because it’s worth the effort.
I looked back at “guys who had TJS, what did they do if they came back 14 or 15 months later” and the results were terrible. A majority of guys were effectively useless, the last time someone had TJS in spring training and came back for a decent second half was Rafael Montero in 2019. Despite a couple dozen guys having TJS early in seasons since then, it’s very rare for guys to be even remotely useful the next year. If guys are useful, it’s once they heal fully after 14 or 15 months then take a full offseason to get into shape, so 20 months or more after the surgery. Many guys come back sooner than that and then struggle with other injuries during that first year, probably because they haven’t had a chance to get their whole body into pitching shape and get the feel back for everything.
Given that, if I were in charge, i would take my time with him. When he is ready to come back I would send him to the minors, and burn an option after his rehab stint ends. Maybe even BHam rather than Charlotte. I’d get him on a starter schedule and maybe start with 2-3 innings a game, maybe get to 5 innings on starts by September. If he’s healthy enough, get to 50 or 60 innings total, and use the fact that it’s the minors to reduce the stress on his body. Then, he’s set up to maybe have a shot at throwing 110 or 120 next year - and I would absolutely think about starting him in Charlotte and burning another minor league option to do it.
What do I expect the White Sox to do? Especially without Hendriks, they will rush him back to the bullpen as fast as possible and hope for the best. That will leave him in the bullpen permanently because he won’t even start building up innings this year, especially if some other injury or soreness crops up, which is very typical for guys less than 2 years from TJS. I fully expect people to say “how can we have this many injuries no one could have foreseen this we are snakebit again” when he sprains an ankle or something.