I don't think Grey Matter necessarily has to be involved in the last episode- it might have just been the motivating tool the writers used to get Walt back in the game and that is all we will see of them. The success of Grey Matter was one of his biggest driving forces for him in the beginning, and the interview clips reminded him of that.
Then again, it could be setting up to have a Godfather-like finish where Walt takes care of all of his enemies in a simultaneous fashion, ending with a final showdown with Jesse.
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