Before and After
Ummmm. I think that for Yesod to be "before" Briah doesn't necessarily mean that Yesod is a predecessor of Briah. Consider this diagram (time proceeds from left to right):
YYYYYYYYeeeeeeeessssssssoooooooodddddddd
...Briah(n-1) Briah(n) Briah(n+1) ....
AAAAbbbbbbbbaaaaddddddddoooonnnn
So that Yesod exists not only before but also after any given iteration of Briah, but "above" it while Abbaddon is "below." This two-dimensional schema allows for, I believe, everything we know about the Briahtic multiverse.
Dan'l Danehy-Oakes