Plot Failure

[Stoopider]

It would be quite stupid for Kakashi to cover his eye just to "be cool." .

Imo, it itches like a bitch. Hence he covers it if not he'll be rubbing it all day and get a red eye. Wait.. it's already red..

[Super5]

I'm with Jaysee, famouh and genma on the sharingan thing. Oro could have transplanted one or both of the eyes from Sasuke, but I doubt he could turn them off. With all the strain of the chakra the eyes take, he would have exhausted and possibly killed himself from this procedure (unless he chooses to keep his eyes closed most of the time). It's much easier and safer to acquire the Sharingan by the soul transfer technique. Unfortunately it didn't pan out for him...