DaddyMakesMeEUHH
(ヽ^ゝ^)ちわー!
Like they say "There's no such thing as a bad idea. Only poorly executed awesome ones".The idea of Sombra or someone like Sombra in g5 could be interesting, however I'm going to be a bit pessimistic and say I don't see the writers doing a good job with executing that. If they want to bring someone back from the past choose a character from the previous gens who hasven't been revamped in g4, like Catrina or King Charlatan.