User blog comment:Firefist553/the 4th strongest/@comment-3387274-20110519212329

franky. He is epic enough to be nearly a monster, but he kept running out of fuel which is what made him weaker.

(none of the others are superhuman in strength)

after that robin because of DF

the weakling trio was nami chopper and Usopp, but I don't think it exists anymore