Wow you’re right.
THAT would have been a good cast job.
I read in an old Star Trek novel that Mitchell was actually Q.
Q had been banished by the continuum and his essence or whatever floated around space for a millenium until Mitchell happened to pass by and then got posessed by him.
This new bad guy have something to do with Mitchell?
Pretty sure the bad guy will be revealed to be Khan.
Always count on Hollywood to have very little imagination.
From what I understand, the new villain in the movie has nothing to do with Mitchell (despite the new actress in the film being made over to look like Dehner, Mitchell's cohort) and this English actor is in fact, reprising a role made famous by the fella who hawked cars that had rich Corinthian leather.