Comprehension mishap: I am not stating that he isn't stronger than Neji, I am stating that whether or not he is, that doesn't help your stance. This is the statement you made that started it all:
Which I interjected by stating that we've only seen two Hyuugas at best, so you cannot conclude that Hiashi is "clearly the greatest among them"
Am I to understand that by your estimation, because this is a mere "speculation", I cannot point out what isn't feasible?
No it doesn't, it proves that the Hyuuga put the Cloud ninjas in a bind last war. That they were formidable adversaries, completely different than "to be feared". If there was a war and the Aburame clan didn't fight in it, but they sent their insects to eat their opponent's food supplies, putting them in a bind, by making the same statement that, "The Aburame clan really put us in a bind last war" they're implying that the Aburame clan is "to be feared" despite them not fighting at all?
If you're trying to get across the point that the Hyuuga clan is strong, then there's no point as that can be accepted. If you're trying to get across the point that the Hyuuga clan is Konoha's strongest clan, after the Uchiha and Senjuu, then you'd be pressed hard as we've only seen feats really from two Hyuugas, one sucked hard and the other proved adequate. Even if we accepted this, there is no way that you can prove that Hiashi is "clearly the greatest among them".