Also, something that crossed my mind rn:
Aizen and Yhwach are 2 out of the 3 crazy insane geniuses of the Bleachverse (and out of those 3*, I dare saying they're on the peak) and not hard to say that they're some of the most insanely powerful guys.
Aizen had to create a plan to tire Yamamoto that almost failed. Also
is on his profile.
Yhwach had to use one of the sternritters that we claim to be very busted to TIRE the old man out so that they wouldn't battle, which is implied that it is not impossible (tho also not close to likely) that Base Yhwach loses this like he did some hundreds* of years ago...
So we can say with rather ease that Yamamoto and Gerard are not on the same league, which, to my support, is said on both profiles:
This justifies a Moon Level for Base Yhwach, while
That's his level on the form we're using. comparable to "adult" Hitsugaya. Can we agree Yamaji would smack Hitsugaya? If not, what about the Zanka No Tachi ratings?
Oh yeah, Royd, what about him?
A level Gerard never gets..hmmm...
Yeah, not on the same league, guys.