User blog comment:Aizen.sama/Are Espadas, Vasto Lorde(s)?/@comment-452405-20100425224657

I wouldn't really call it "take on kenpachi and byakuya" as from what we saw last, their kinda turning taking out Yammy into a sport. Plus he can't be any stronger then 5th currently as his release didn't do any visible damage to Los Noches, something only the Top 4 had the power to do hence why they weren't allowed to release under the dome.