The "100 times" math kinda checks out. Zoro went from 108 pound canon to 1080 pound canon immediately after timeskip, i.e., he became 10 times stronger during the timeskip. Its not farfetched to speculate post-Wano Zoro is 10 times stronger than FI Zoro. That said, G5 Luffy has to be stronger than old Rayleigh.