We all would love for Usopp to be strong in the pirate world and capable of holding his own but relatively weak next to the monsters in the SHP. Like Izo next to WB, Ace, Marco and so on.
But in the case of Usopp I’m not sure he beats Water 7 Paulie, Alabasta Bon-Chan, Sabaody Bellamy or Skypiea Wiper, never mind Hody Jones or Kyros. We are already in Elbaf and I’d still not give Usopp more than 50M bounty based on strength.
Luffy cant send Usopp to protect an Island under attack even from a decent rookie crew from West Blue that just entered the Grand Line.