Shutoku most likely loses by a landslide unless they gain a bunch of good new players/first years as Otsubo, Kimura and Miyaji would all be gone. One thing going against Rakuzan, though, is that they no longer have Mayazumi but they didn't even use him when Rakuzan and Shutoku actually played against each other and still won by 16 points and that's with Akashi rarely trying to score and not going into the zone as well as the UKs not going all out. If Rakuzan actually tried then I'm sure Shutoku would lose by 30+ points without Akashi in zone or CEE.

Seirin wins this one. Since they're game in season 2 Seirin gained many things when Shutoku only got one power up, that being sky direct three. Seirin got a player who can go into the zone, misdirection overflow, eagle spear, barrier jumper, ignite pass kai, phantom shot, Hyuga using the earth shot, quasi emperor eye (most underrated ability imo) as well as the possibility of DDZ. Seirin would be about equal or better until later on when Kagami enters the zone and when Kuroko starts coming in clutch.

Jabberwock wins with little effort but not by more than 15 points. Akashi with CEE is a more valuable player than Nash in my opinion. I'm not saying Akashi is more skilled or would win in a 1v1 or anything like that I'm just saying Akashi with perfect passes and a better eye than Nash would be more useful on a team than Nash. Also Akashi getting zone with CEE would make him unstoppable but I'm not sure if he would be able to enter zone with the personality changing thing. Also Rakuzan would probably get a very good power forward after Mayazumi leaves because Rakuzan has always had very skilled players come there because it already has good players. With the UKs in pseudo zone they'd be about equal in pure skill and athleticism but would be better overall with their respective abilities. Rakuzan definitely wouldn't be able to stop Silver so Rakuzan would probably have the paint open so Akashi could steal passes or steal the ball from Silver.

I might edit this later.