As an unrepentant Togashi fanboy, I just need to say - final tournament/Book 3 Yusuke doesn't actually body everyone unless he eventually learns Haki. Logia users and the weirder paramecia (think Hancock/Foxy) can either invuln tank him or incapacitate him. Remember that Yusuke doesn't even win that tourney (And being the competitive knucklehead he is, I really doubt he threw his fight even if he didn't care about being ruler of Makai). Hell, none of Team Urameshi made it to the semis unless I remember wrong, and Hiei/Kurama arguably have better abilities for a One Piece battle environment (enhanced omnivision/plant control).

Now, MAJIN Yusuke? That possessed sumbitch with all the demon king hax available to him? That guy would punch a hole in Kaido, Big Mom, King, Queen and Ace in a line. That guy approaches DBS Hakai levels of bullshittery in terms of pure destructive power.