in my opinion i think he will tell him he was so sorry for not protecting rin and because he broke his promise he should give back obitos eye to its owner what do you think :shrug:
give back the eye so that obito gets a complete kamui and just to be clear tobi has ambtions other then asking for an apology from kakashi (infinite tsukyomi)
Proboly going back to saskue and orchimaru part of the story....... That or explaing why obito wants to do this when obito was not realy evil at his time.
"So, Obito why you trying to put everyone under genjutsu?"
"Don't talk to me right now Kakashi you didn't keep Rin safe and left me to rot under some rocks, all you had to do was use chidori to smash them DUH!"
"Oh, right lol ok" *plucks out sharingan* "here have it back" *licks clean*