Well Hashirama was certainly weaker than his mortal self though I'd argue Tobirama gained more versatility since he has Edo specific techs while Hiruzen wasn't restrained by his mortal limitations.
It also helped that the Kages all received benefits for being reintroduced after Kishi's power creep took full effect.
Yeah I know they were all weaker than they were when they were alive but as far as combat effectiveness goes someone like Hiruzen wouldn't be hindered by stamina problems thanks to Edo chakra/regen.
With that said Minato and Tobirama might be the best bet for victory. Even w/o logia intangibility Akainu and Aokiji have powers that are a perfect counter for the Kage mvp Hashirama. There's still Kizaru's lasers to worry about as well.