Hashirama wouldn't be able to use the rinnegan.
Why not?
Hashirama has a better chance of using the rinnegan as much as Naruto does.
He doesn't have the knowledge and the spiritual energy to use the rinnegan like all the other previous users. Nagato did years of training and summoning the Outerpath nearly killed him.
Ashura's aren't really cut out to use Ocular power like that, it's like getting Sasuke Six path sagemode.
Rinnegan is ashura(body)+indra(eye) power. Madara could use it to its full potential even when he was originally only half of the power. Hashirama who represents the other half should be able to use it just as well.
Madara used six paths senjutsu well too, if though he is an indra not ashura, Hashirama would have no problem using rinnegan
Hashirama is not a doujutsu-type.
Nagato had his entire life, like 30-40 years?, to train with the Rinnegan and still was very weak compared to Madara and Sasuke. Madara, as an Uchiha, is a doujutsu-type AND the original user of his Rinnegan which is very important for doujutsu-users. So without doubt, Madara Rinnegan > Hashirama Rinnegan.
No, Ashura's body is senjutsu. Ashura's chakra is what is needed to turn Indra's chakra into Hagormoo's chakra. Indra's incarnate with Hagormoo's chakra can awaken the rinnegan. That's how it works. Hashirama lacks the ability to use an ocular power such as the rinnegan.
Do you believe that someone like Naruto can wield the power of the rinnegan? Because saying that Hashirama has that kind of potential is saying the same thing.
Madara needed to become juubi jinchuuriki in order to gain rikudou senjustu. That's different from naruto who doesn't need a juubi.
It doesn't make sense for an Ashura incarnate to use the power of an Indra incarnate as much as an Indra incarnate to use the master the power of an Ashura incarnate. Ocular doujustus are very taxing on the spiritual energy of the user, these are attributes that Ashura ans hi incarnates lack.
This exactly.