If they had a great story that focused on Mitchell, they would use Mitchell regardless of the comics. And the comics are not canon.
That would make sense if the comics had come out before the movie was written, but as Orci is involved in writing both and they have said a couple of times it is supposed to fill in some of the time before the two movies its unlikely he would use the same villan twice.
Thank you for making that point. I'm really sick and tired of making it myself again and again. The comics may not be a hundred percent canon, but they will not violate major plot points of the movie!