Asta has no mana in BC but to Zeshia, he'll have magic power because he exists and is alive. He'll just have too little of it and would be unable to use magic or control said magic power.
This literally contradicts Asta whole existence, if you literally are equalizing verses, and give Asta magic power for reasons of your verse, you have to accept antimagic nullifying her, you are saying "she has resistance but not in the profile" while I am not using anything related to updated Asta
Gaja used his own life force to fight and was gonna die, but not for using all of his mana, having mana is not making people alive in BC
This is like saying a fullbringer can manipulate the souls of the weapons of another guy in one piece because in bleach, objects has souls, that is related to his verse, not a crossverse fight, even worse when Asta has hax for literally not having mana and you are now giving him that, is simply not possible
Also, why now Asta needs to literally negate every aspect of the magic instead of said magic system being able to resist antimagic as a whole? Asta has one layer accepted right now in devil union, and again outdated Asta, all the fights with Asta are the same, "no, he can't negate this because it has one difference" instead of you asking if your character can do anything against a power null, magic in BC has progressively become stronger and more haxxed and Asta never had any problem negating that, only if the opponent was stronger
FInally, her magic is conceptual type 1? Her page does not says
Anything about her having conceptual manipulation[Only a resistance and is type 3, the same type Asta has interacted and is accepted on BC profiles for now], only that her magic can interact with concepts, same with Asta, right now, Asta nulls her and she has no resistance to causality manipulation either, if you disagree, change her profile