Warcury might be one of the strongest characters after Akainu...
Warcury > Kuzan > Akainu > Garling > V. Nusjuro > Kizaru > Fujitora > Green Bull > Mars > Ju Peter > Saturn
I think Kuzan beat Sakazuki and they lied about it, to have Kuzan infiltrate Teach.
Sanji and Zoro clashes with V. Nusjuro fairly evenly, Luffy in Gear 5 couldn't do shit to Warcury.
Warcury is a giant problem, I think he and V. Nusjuro are monsters even without regen.