.Minato was stated to have created the Rasengan, not Ashura.
.Indra's MS design was a swirl. Not Sasuke's.
.The manga stated that Hagoromo was on his deathbed at the time he named a successor, so there's no way he could've fought beside Ashura.
.We have no idea what color Indra's PS is and it was bigger than any other Susanoo. It was definitely not Sasuke's.
.That whole Byakugan evolves into a Sharingan was BS and you know it.
These are just some of the points.
Not saying I think it's canon, but a lot of those aren't wrong or contradict anything.
-Rasengan being used by Ashura despite it being said Minato made it is the same case as Indra having MS despite it being said Madara and Izuna were the first ones to have it, or all that hype about Hagoromo fighting and defeating the Juubi on his own only to find out Hamura helped him. History erases and changes things with time after all.
-Agree, but even Kishimoto has done this with other Dojutsus.
-This may be true, but again, these words were coming from people like Obito and Madara. I don't think I need to say this, but the manga does this with the Ootsutsuki backstory as well (in terms of changing things with the excuse of "X not knowing the true history"). If we are being technical, if it's not from Black Zetsu or Kaguya, nothing said in the manga regarding the Ootsutsuki family can be relied upon, not even Hagoromo since he was left partially in the dark by Black Zetsu.
-I don't get how Indra having a small Susano'O initially and it being the same color as someone 1000 years down the line is a contradiction.
-Hagoromo didn't have Byakugan, he had white eyes. Just like how in Bolt, it is said not all Hyugas have Byakugan, but all Hyugas still have white eyes as shown by kid Hinata/kid Neji. The same applies to the aliens.