That never happened, and the adult Stryfe instead became one of Cable’s greatest opponents.
Like Cable, Stryfe also traveled back in time to the present day, where he formed the Mutant Liberation Front.
Unlike Cable, whose powers are continually being used the keep the techno-organic virus at bay, Stryfe has full control of his natural telekinetic and telepathic abilities.
So for now, Stryfe is far from confirmed to appear in X-Force, but he’s certainly a worthy candidate to be the movie’s villain.