I just watched this fight last night after hearing all the controversy. This is the way I see it:
Something happened to Kos. Not sure if it was a poke but his eye didn't get like that on it's own. Either way it was unintentional.
Rumble pulls a illegal knee.
Kos accidentally pokes Rumble trying to paw a punch.
Kos pulls one of the most intentional eye pokes I have seen to date.
Normally I would cry foul on Kos but the illegal knee earlier in round 1 makes me think it was just evening the playing field. Good fight!