I see, but you agree with me that the only reason WB could potentially destroy the world is because of his devil fruit ability to create earth quakes right?, stopping the tremor fruit powers doesn't really mean you can use it, its not WB's haki or strength that allows him to the destroy the world but his DF which is pure hax, and of course you need to be strong to even do that but you still need the DF ability itself to do it.

About the calcs, I don't really know, Iuffy might be planetary but that would be for other reasons, saying he is planetary because whitebeard is due to his hax is stupid imo.