First of all, welcome back man.
Did you not forget that the 4 Hokages will be joining the battlefield? Sasuke is not going to take them down by himself. Besides, Naruto has been fighting in the war over the whole recent chapters. Sasuke showing his abilities is only going to erase the claims that he hasn't shown what he can do yet. As a matter of fact, both Naruto and Sasuke hasn't shown their full potential yet. There are several possible powers that they both haven't applied in combat.
And didn't you make similar a threads like this already? :|