Therin of Andor wrote:
a Gary Mitchell in star fleet who possibly never made it onto the Enterprise in this time line could make sense.
Nah, we've been through that one. They wouldn't have bothered approving, then wasting, the character for the IDW comic. Only to have to reintroduce
Im less certain about it than I used to be, but I did bring up why appearing in the comic may have made it more likely, not less. Also if that statement made by the source is true, it's not Khan and the other choices seem not to fit what we've seen of the movie so far.
I'm still sure it's not Khan though it may be related to Khan in some way.