Toad needs dupe for defense?

Darkraw346

And how about offense? Cuz despite the fact the dupe gives him easy access to Prowesses... his sp1 Prowess r like +70% dmg each and 5 of them. Dupe only +25% dmg at best and 10 so I think the sp1 prowesses are much stronger anyway. Thank you.
Also what rank is recommended?