Was that an actual argument? Because I've seen people speculate about Shirahoshi joining. lol
Shiraoshi is actually gigantic but yes the Perona/Hancock main argument(or one of) about Jinbe not joining was him being to big, wouldn't fit Sunny doors.
I think AGOG or that Super something guy(Perona fans) started it, they would also write gigantic walls of text talking about it.
Edit: damn none remembers the other crazy Perona fan? the guy that even post timeskip he said she would join later, he basicly would make the argument that she will join in the future everytime and opportunity went by, I believe before he was banned he was talking about a future Moriah arc that would make her join haha.