Bellamy did nothing, he got his ass kicked by an executive, had to be saved multiple times, the only reason his fight with luffy took so long is because Luffy didn't want to punch him. He got owned by Barto's barrier and beaten by the king's punch.How the hell is Bellamy not strong enough but Viola is?
He is absolute shlt.
Besides Bellamy's powers are to similar to Luffy's, he has no room on the Sunny to uniquely develop himself.
Violet showed herself a smart manipulator with a very useful devil fruit. She can add something to the SH arsenal.
What you seem to forget that you don't need power to be strong.
Therefore Violet is stronger than Bellamy