no minato is not stronger than before he only has access to kcm because of being an edo and he is going to give naruto all that chakara once his role is done so take a chill pill fanboys kishi is doing this to make minato look more badass to naruto sealing that chakara required the reaper death seal which means it would have been impossible to use that chakara living so itachi>minato stilll but edo minato>edo itachi i suppose but that doesnt matter