Others always spout this equality between Noodles and Sauce, what about Sakura? Kishi tried to portray her as Tsunade's counterpart so that the three of team would mirror the Sannin, giving them the semblance of equality:
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But alas we can see they are clearly not equal.
We move forward to the present and we see Kishi trying to portray equality between Noodles and Sauce by making them Ashura and Indra's transmigrants, but again we see that they do not appear to be equal.
Did you not notice that Sasuke had been in the sideline this whole war? in the Kabuto fight he acted as support to Itachi, same goes for the Juubito fight and the current Kaguya fight.
In a Manga named after the main character, the best a deuteragonist can do is to become second to him.