I'm not sure I'd conclude Cooke's sophomore year was better than Williams...I'd say they were about even. I think the big difference between the two is how they play when they're ineffective. When Williams struggles, she tends to disappear and not contribute, whereas Zia will continue to take shots at a low clip and ends up being a detriment to the team offensively. That's a big reason why I think Williams is a better player than Cooke, stats aside which also favor Williams. Both have been good, but neither has lived up to their lofty HS ranking (Williams is far from the top player from the 2018 class, Cooke isn't the 4th best in 2019).
I also disagree about the backcourt comparison, mostly due to how good Paige Bueckers is. I don't think anyone on UCONN or SC is anywhere close to being as good as Paige, we saw evidence of that in the head to head game and several other times throughout the season.
I'm very intrigued by SC's class next year and watching how Dawn integrates her players. Johnson/Rivers look electric from the footage I've seen and could be big impact players. Feagin has a tougher time making an impact IMO with Amihere/Saxton/Boston ahead of her but who knows, maybe she'll be a regular rotation player. I agree depth and playing fewer minutes will be a big factor for Dawn's kids next year, but I feel the same about UCONN who had Paige playing 36 mpg and Williams playing 34 mpg. Both in theory will play fewer minutes and have fresher legs too. We'll see though, Geno is usually tighter with his substitution patterns than most coaches, and Dawn may be more liberal in spreading around minutes.
One factor that isn't spoken enough about is that both programs will have to navigate establishing a rotation, figuring out playing time, and keeping personalities and highly touted recruits happy on the bench. Both teams will likely have multiple top 5 recruits coming off the bench, and highly touted kids who may not crack the rotation at all. Having a plethora of talent comes with a lot of pros, but it also presents some personality challenges since there are only 5 spots on the court and one ball to go around.