I'm with you on Denjiro for now.
But with the Oden-Kaido , Ashura-King potential portrayal during the flashback, I think there's a possibility Ashura is on par with somebody like King (just a possibility).
Though tbh, seeing how Smoothie is only 34, she also has the potential to end up being the strongest of the sweet commanders if Oda wants her to be in this Arc.