Jake using the guns from Face/Off seems like it was probably intended to serve as another red herring indicating that English would take over his body; i.e. that he and Caliborn would have a Face/Off of their own at some point. but the fact that actually watching F/O reveals it to be a movie about The Horror Of Getting Cucked might be another clue that Jake’s destiny is just like that of his forebear Cronus, the ultimate cuck: English’s power is going to bounce right off him and go to his descendant instead.

the fact that Jake’s arc in the Epilogues mostly consists of him getting cucked all the time by Gamzee (who is Lord English) probably plays into this