i'm fine with whatever decided, whether there'll be changes or not. both hegemonies were already emanating by that point so i'd think you can either give reinhard or ren an outright 1-a rating due to that reason or to just keep their current rating as it is and just give ren the same clause as what reinhard have, that being an eventual growth into 1-a (law emanating and ren conciously holding it back) and his law being 1-a (that it's directly powered by his dad and that it's comparable to reinhard's own. with what's making reinhard's to be 1-a are already listed on his page). if these all got through
just my 2 cents about the briah's weakness part, but i think that its weakness still being a thing can mean 2 things, really. and it kinda make senses and all fall into the right place when you consider all the parts and bits
either it's still a briah, but with the potency of a tier 1-a. normally its weakness wouldn't even matter as it's a 1-a power affecting someone so why would its weakness become a factor unless the opposition is 1-a themselves right? but then said opposition did got blessed by another party who have the same clause as ren and make their power to be similar in scale, and the man in question already got his hax listed as 1-a anyway
or it can also mean that because hes already emanating at that point anyway, it probably not even a normal briah. it can be briah bordering on atziluth thing (kinda like reinhard's i guess), it can be outright atziluth, or something else. call it whatever you want, really. it can still have the same mechanism or it might not, whatever the case is fine either way. but it still doesn't change that the commanders are boosted by reinhard himself. which at that point it'd like a god affecting 3 another gods on similar level, at which point, ren becoming unable to affect them perfectly makes sense. even when hes an actual full pledged god, he still cannot fully affect either mercurius and reinhard whos on a similar level to him anyway. so it's something similar to that scenario i think
in either case. it's practically a z power performing on x scale failing to affect characters a, b, c because all three of them are on the same x scale through some mean. if anything, you can argue that rather than being a showing against power z's performance, it's a showing for character a, b, c own performance,resistance
also you said something about hitting with 1-a power. i don't think that's a fitting point to make. what's being discussed is hax rather than power. something that can work on a different scale than the possessor's actual level of power. neither ren or reinhard is hitting someone with a power of 1-a as a non god entities, but they're affecting someone with a power that can work on that scale. at that point it's less about power and more on the line of "can you resist it?"
edit: guess using the word power on both clauses can be misleading. what i meant on the former was something along the lines of pure strenght. while the latter being something like hax
