I thought he was only using the Knee Trembler as part the feud with Regal by utilizing his signature moves. I wouldn't mind if it became part of his arsenal since it could be the move he uses against the bigger opponents.
If he adopts a submission I hope its the Crossface Chickenwing. Along with his Pillmanesque loose cannon persona, I also see shades of a heel Bob Backlund circa 1994 aswell. I do recall him using it in at least one dark match earlier in the year.