Re: uchiha brothers against eternal rivals
Assuming Kakashi and Itachi have fresh, non-blind eyes, I'd have to say Gai and Kakashi.
Whenever everyone makes a Top 10, I always hear "Sasuke". But honestly, I feel he is way too inexperienced to keep up with the big boys. I feel all he relies on is his eye powers, and doesn't really use his head or strategies. Itachi is on par with Kakashi's intellect and has tricky genjutsus, but he will probably he caught up trying to save Sasuke's @ss.
Of course both teams would fight as a combo, but if you compare members, I can see Kakashi taking out Sasuke. Especially since he has gotten used to Kamui and managed to spam it like crazy. His endurance has nearly gone up nearly ten fold. Gai is already accustomed to sharingan and I think he can actually take on Itachi 1v1. I'm not sure if genjutsu still affects someone who opened the 7th gate, considering how much chakra is flowing everywhere. Yes, Itachi has the Yata Mirror, but last time I checked, Hirudora can crack Susanoo. And the mirror is probably only on one side, which Gai is more than fast enough to get to the other side of Susanoo.
With Sasuke being inexperienced and Itachi literally only having like 2.5 stats for stamina, Gai and Kakashi take the battle.