I haven't look much into the CoC scene
But after looking at again.....lol, there is no way to back him up even for the hardcore GB simps.
It even look like a comedy cartoon version when stronger character intimidate much weaker fellow.
And the next few panel look weird, so GB just left like that obediently?? Lmaoo,
On the other hand It's a lazy ass writing and it has no flows, Momo and scabbard just celebrate like that in next panel..........
Oda make GB to come in Wano to show Shanks flexing, otherwise there is no definite reason. Poor him.