The (let's call it) parallelism of Trebol with Yasopp doesn't make any of you think he'll fight Usopp?
I read some comments about the similarities but I didn't give it a thought since it should be clear that Usopp cannot defeat Trebol as he is now, even though we don't know his limits yet but since he is a Strawhat we know that he'll play a big role during this arc and his character will grow in bravery from this point on.