Sure but if the F6 are really not too far from the calamities in power,it would mean Franky is near someone like Zoro in power and portrayal doesn't suggest that.
I would argue that pre-time skip we had every reason to think Franky was the next strongest in the crew after the monster trio. The gap between YC1 and F6 is pretty big, so Franky taking down an F6 while Zoro beats King would be fitting imo.
I would also argue that Franky actually has some weird portrayal equivalents with Jinbei. Both knocked back BM and told her to fuck off cuz Luffy will be Pirate King. And based on that one spoiler sketch, Jinbei and Franky are being portrayed very similarly.
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I don't think this is stated anywhere in the manga. We shouldn't know what material were the MF wall and PH door made of
I’m like 99% sure in an SBS Oda confirmed it was Wapol metal. One sec.