Sorry bro hate to brake your bubble but Naruto still have 3 TSB behind him at the time Sasuke prepares his Indra Arrow.Naruto was especially low on chakra, and had no more TSB to make into Rasenshuriken, meaning yes he could have made a stronger attack but only if he still gathered the Nature Energy. Without it nothing he can muster matches the force of Indras Arrow by Bijuu chakras.
I see no reason why Sasuke cannot make another Indras Arrow on his own. However, It'd probably be a last ditch effort recquiring mass chakras which weaken him.
Going by the theory that Sasuke could make one own his own I dont think its in Sasukes best interest to clash head on with Naruto jutsu-wise. But as we all know, Sasuke has very powerful chakras, it'd just take a huge toll on him.
I agrees on chakra part.
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