I think all four of them would be obvious "takes" if they want to come back.
Brockington is a monster.
Kalscheur is limited offensively but a high-level defensive stopper. He's played a lot of college basketball and has played more within himself the past couple of weeks. He's likely to be better than Lipsey and Eli King as freshmen and probably better than any replacement you're going to find in the transfer portal, and needing to find *two* replacements for Brockington and Kalscheur is much to ask of TJ.
Kunc has really come on these past few weeks. He's an elite outside shooter.
Conditt doesn't have the highest ceiling for a big man, but good bigs are notoriously hard to find in the portal and in high demand from the blue bloods of the sport. I'm fine with TJ recruiting over him -- or over anybody really, save maybe Hunter -- but he's at least a high-floor option at this point.
So I invite all four back, find out which ones want to, and then plan from there.