It's certainly possible. My theory was always that code transfer didn't go through until the new bearer died (which is why CC was 'killed' in that one scene, and thus it's possible that he really *did* Geass Charles back then but it was all according to his keikaku) and thus it would turn out that he got Charles' Code somehow, which would allow for a fake death. When I saw Suzaku!Zero go for Lulu I was like "nooo- oh, wait, they're going to go with that twist" but then CC was alone in that last scene, so that pretty much kills that theory. Perhaps that was one last troll for the fans, that they get us expecting something like that and then go 'OH SNAP NO HAPPY END FOR LULU FOR YOU BITCHES'.