I say each of RHP would have been able to beat luffy pretty low diff pre timeskip.
Mr. trollins just tries to provocate, like always. ¯\_(ツ)_/¯
Additionally, it seems like kid had to choose between 2 options, I would put my money on „getting Killer killed“ or „losing an arm“. He chooses the arm obviously. In that case, the strength of the cutter doesn’t matter at all.