Cody williams no question.
I alluded to this in another post, but as much as I like Sochan and think he has Scottie Barnes-lite upside, he's ultimately a little small to be a true 4. You don't want to give up positional size at both the 3 and 4 positions, so ideally you get someone who's 6'8" or over to play with him. Cody williams is 6'8" with a 7'2" wingspan and has the frame to fill out just like his brother. He's super raw but from the clips I've seen of him, he actually has the length, potential for strength, and the defensive savvy to serve as a POA defender allowing Sochan to better utilize his glue guy skills. His 3 ball needs work and his shooting signal is mediocre, but I'm willing to bank on his youth and work ethic. I saw somewhere that it's way easier to marginally improve a bunch of ok-ish skills than it is to completely overhaul something that's completely broken and I strongly agree with that. Cody williams is actually ok to decent (not good to great) at a ton of stuff including his handle, defense, shooting, and passing and I'd be willing to bet on his development on the margins. Additionally, trey jones has shown himself to be an actual serviceable starting point guard (did not expect his defensive EPM to be 0 at this point in the season) and so wing is probably a more pressing lead than lead guard unless you have the rare chance at getting a true big initiator which I'm not completely convinced Topic is.