Return to what? Getting obliterated? Even Hyogoro that can blast Haki out of hand, said all he can do is "slow down" Tobi Roppo.
These guys are on Apoo's and X-Drake's level. P1 brushed off an Elephant Gun from Luffy. That means Usopp needs > G3 levels of power. Saying Nami and Usopp are going to beat them is mass stupidity. We told you guys, and still keep going at it.