I think that Varis thinks that we would not only be on the same level aethorially but also somehow all turn into pureblooded Garleans. I don't think the last would be the case. We also don't know if everyone would be the same aether wise. Everyone would gain a boost to their aether, but would everyone be equal? As we know when the Convocation sacrificed more to get the ball rolling again the new life didn't have the same amount of aether as those who were still an Ancient. That difference being one if not the only reason why they went nope I want a reroll.

So, would everyone if we rejoined the rest have an equal share of Aether or would those who have an Ancient soul have more? Since even with seven joinings there are different levels of aether in people. Look at the youngest of the brothers who run the THM guild. The poor guy can't make fire flicker. The girl in the RDM questline also doesn't have a lot of aether vs us and X'Ruhn so that casting spells is hard for her.