batterymans:

small brain: sami comes back the same & nothing notable happens character/dynamic wise

big brain: sami comes back face after reconciling w his inner truth & tries to fix bridges hes burned as he pulls away from kevin

galaxy brain: same as above, but he tries to bring kevin with him, whether he succeeds or not

universe brain: sami comes back Meaner/Angrier/more Vicious & cuts a path thru the roster and we watch as kevin has to come to terms w just how far hes pulled sami down & take responsibility as a corrupting agent