When I mean WB parallel, I dont mean in personality or anything, just that he's the one pirate that stands equal to Luffy for now, out of the supernova at least.
This of course only lasts if Luffy defeats Kaido and Kid either doesn't play an instrumental role in defeating Kaido (doesn't get a final attack in with Luffy) or doesn't defeat Big Mom. If he does do either, than it would only last if Luffy/Kid decided to fight each other later on or something.
Law to me ha already lost ground in that department.
Curious though, when did he struggle against Queen? They fought?