We all know how Hiruzen could use every Jutsu in Konoha which means that the moment someone enters Konoha his abilities and KKG/KKT get scanned and absorbed into Hiruzen.
Having said that important factor, we all know how Obito once was in Konoha in his young time, now...
Since Obito had been in Konoha before (and even after he "died", like when he attacked the village for example or even later with Sasuke) it's safe to say that Hiruzen got all his abilities, even the abilities that he gained from the Juubi!
This explains why Hiruzen knew about the ability of Obito after becoming the Juubi's host. This means that Hiruzen is able to use the Juubi's chakra and shape it like Obito did:
Now, having said all that, we can look into it even deeper:
Remember this? Exactly! Since Pain infiltrated Konoha Hiruzen managed to gain all of his abilities since Pain was in Konoha, and we all know Hiruzen can use every Jutsu from Konoha. This means that Hiruzen can use all the Rinnegan abilities aswell (aside from Rinne Tensei because Nagato didn't cast it inside Konoha if I remember correctly).
Thank you for listening (with your eyes) to my thread.
Having said that important factor, we all know how Obito once was in Konoha in his young time, now...
Since Obito had been in Konoha before (and even after he "died", like when he attacked the village for example or even later with Sasuke) it's safe to say that Hiruzen got all his abilities, even the abilities that he gained from the Juubi!
This explains why Hiruzen knew about the ability of Obito after becoming the Juubi's host. This means that Hiruzen is able to use the Juubi's chakra and shape it like Obito did:
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Now, having said all that, we can look into it even deeper:
You must be registered for see images
Remember this? Exactly! Since Pain infiltrated Konoha Hiruzen managed to gain all of his abilities since Pain was in Konoha, and we all know Hiruzen can use every Jutsu from Konoha. This means that Hiruzen can use all the Rinnegan abilities aswell (aside from Rinne Tensei because Nagato didn't cast it inside Konoha if I remember correctly).
Thank you for listening (with your eyes) to my thread.