"Q: Sosuke Aizen and Zaraki Kenpachi are two of the strongest characters in the series, yet they never get to interact with each other. Why is that? I always wanted to see these two fight each other.
Kubo: I mean, that’s because a fight between these two wouldn’t really be any fun…"
"Q: To what degree of injury and illness can Kaido be used to heal? Also, do you have to visualize the function of each organ in order to restore it? Or is it more like a surgical operation?
Kubo: “Healing according to one’s imagination” is the accurate way of describing it, but as you need to properly heal the blood vessels and tendons, one needs to possess proper knowledge of the body’s anatomy."
Where did Kubo say Aizen his stronger than Kenpachi? (on wiki Kenpachi is still weaker than Aizen anyways in basically every way, I'm not saying that statement is inaccurate, but your claim is)