Either way, He's still weakened without having the Sharingan no matter what. I admit he'll still be strong, but he has relied on the eye heavily and now his raikiri is an incomplete jutsu once again.
However, that doesn't change the fact that the Sharingan drained his chakra. As I stated before, I don't deny that the Sharingan made him significantly stronger, but it could exhaust him to the point of being in bed for a week+.
My point is that when the war started he was able to use his Raikiri and still be able to fight and continue to use Kamui and he just kept going, implying that:
a) His chakra control is top-notch. Proven by his ability to use only the right amount of chakra required to do each technique and saving his chakra for later.
b)He has a considerable chakra pool. All this said because the techniques he uses (and he used to spam Kamui quite a lot) are chakra demanding.
Now that he doesn't have the Sharingan, which he couldn't turn off because he isn't an Uchiha, constantly draining his chakra and 1000s of jutsus he learnt, combined with his experience and chakra boost you tell me he is useless?