I'd have to go back and watch the replays, but I don't recall that Joey was completely ineffective on defense. He looked okay against Syracuse in limited minutes on defense. That foul he picked up right before halftime came on an impressive chase down block that the officials incorrectly called a foul (it was totally clean). Regardless, he's certainly just a bigger, longer body than Alex. He was also a top 20 overall recruit in his original class (2019), so he's talented.
This is just an extremely intriguing development. I can't remember the last time we unexpectedly gained a new player in the middle of the season. I'm very hopeful that he can play well and start expanding his role. This team always feels like it's 1 reliable shooter away from being unstoppable.
Coach K knows what he's doing. You can't hit the freshman wall if you only play 12-13 games