Quote Originally Posted by bbaucom
The MS was not a result of just losing your best friend in kakashis case, but killing your best friend. Which is why sasuke did not gain ms in that way because he wouldn't kill naruto. you can only assume that kakashi gained the MS in some other way between his meeting itachi around chuunin exam and current story line.
Meaning that there must be more than one way to obtain it. Perhaps the look of the Mangekyou Sharingan is affected by the means through which it is earned? Itachi's eye looks much different than Kakashi's, and they each use different powers. Could it be that the power of each type differs, which would make one route of obtaining the MS more beneficial than the other(s)?

Or is speculation that Kakashi obtained it through guilt about Obito's death, and merely took this long to realize the power a more correct branch of thought?

Kishi had better explain this one soon; it's getting irritating.