How the hell is Tobi going to be identified after taking a Super Kyuubi level 10 Sage mode Rasengan to the face?

It can't be Rin, as the frequency of Kamui's use by Tobi suggests only a natural Uchiha body could withstand it. I'm still not giving up on it being Izuna; he could be just trolling Kakashi to win the fight. Besides if it does turn out to be Obito it would plot hole the timelines vis a vis fight with Minato etc.

Also, the amount of times he has used Kamui means he should have gone blind by now if all he has was normal MS, like Itachi, Kakashi, pre-transplant Sasuke/Madara. The fact he can still use his eye must mean it is an EMS, which follows that it isn't Tobi's natural eye but rather a transplant.

Thirdly, the fact that Kurama thinks that Tobi is Madara must mean either Tobi posseses Madara's chakra or his own is almost indistinguishable from Madara's. The former could mean it is Obito through some trick, whilst the latter could point to Izuna.