So your saying that Naruto can Abandon chakra arms? They did have to return to his body and i doubt he can just throw amaterasu. And the gudoudama are different while ino Narutos use. Obito had them on his hands aswell and he had holes in his hands while Naruto doesn't, and Naruto has only been shown to use them offensively
Those are the steps to getting the rinnegan, Sasuke already had ems, he was on the verge of death and he had both ashura and indra dna, the same with Madara, but Maybe The sage enhanced it or something, same with Naruto, he already had some of the bijju's chakra before he met the sage, because obito took it from madara and put inside him
But Naruto has not been shown to use them defensively. Obito was a juubi jin and had them on his hands with which he defensively used them
Hogoromo probably Just altered sasukes rinnegan to make it a wee bit better
You don't need holes in your hands. The only purpose for the holes in Obito's hands were to help Obito shape the balls into different forms. The holes actually had nothing to do with the negating process. Spherical floating balls can still negate ninjutsu as shown when Obito negated amaterasu after being hit with halo jet black arrow style zero. The balls just floated to the flames and negated them.
No no no remember when killer bee was on fire and got Karin on fire too? And again Naruto had not been shown to use them defensively, if he could that would've been really helpful against kaguya
He has used them defensively. Remember when he blocked those arrows. He has also shown that he can shape them by making platforms. Besides, using them offensively does not take away the ninjutsu negating properties. Nothing ever said "gudoudama negates ninjutsu only if it is being used defensively".