I want to do this...I hope I am not just asking for it with this one

[Gods_Son]

Sasuke has a level 2 cursed seal now, Neiji can't beat him

[Lee Rock]

I don't really see how it is all that improbable/unlikely for Hiashi to beat Itachi. Now I do admit that it's been a while since I've seen the below area of the anime/manga so my recollection may be off, so please correct me if I'm wrong...

When you take Byakugan vs Sharingan the key is the Gentle Fist style taijutsu that the Hyuuga use that would make the difference, more than the Kaiten or the 64 points. The thing about this style is that it allows the user to directly deal damage to his opponents internal organs. There is no counter this short of actually dodging the blow entirely.

Now I believe that it is possible for a high level Hyuuga master like Hiashi (Hinata's dad) or Hizashi (Neji's dad) to cause someone's heart to basically explode inside their chest. If my faulty memory is correct that is what Hizashi did when Hinata was briefly kidnapped by what was assumingly a high level Thunder country ninja. This pretty much enables them to get a one-hit kill on virtually anyone.

As such I think that if Hiashi could get one good shot in on Itachi he could end it quick by causing serious internal damage. Now you could argue that Itachi would use the mange sharingan before that could happen, but that is besides the point. I think Hiashi (or his brother if he was still alive) would have a 50-50 chance against the Naruto world's fan appointed god.