Board Thread:Questions and Answers/@comment-28340828-20180616205329/@comment-34461919-20180617012103

The fact that that weakness was even there at all can technically qualify as a weakness itself. As there was a "time" when they weren't almighty, their weakness weighed down their "power" (As their power must be below a Tier 0, as Tier 0s are omnipotent), and this weakness eventually being gone does not raise this "power", it would remain the same, thus the limitation of a past weakness.

Either way, that quote from the tiering system still does not support your point over Promestein's blog.