I like your Theory because, who has the “Blue” light sabre??? Its like following the wand in Harry Potter. Its a blue Light sabre… and clearly the model Luke had in Episode 4 or 5, OR its Obi Wan’s from 4. Luke built his own sabre for return of the jedi. so is that Luke’s old Sabre lost in cloud city (end of the duel in ESB) or is it ben’s fallen sabre from the death star battle in a new hope??? I think JJ Abrams is THAT SMART when you look how creative he was with Star trek.