Leon is mentioned in code veronica but he doesn't have any role in the game: he does not appear in it, he doesn't have cutscenes, you don't play as him. Acting like he should have scenes in the remake when in the og he doesn't because of a mention is incorrent and arrogant
Phainon is his own character. We are allowed to talk about him without mentioning some other character. No he is not some packaged deal when he's a character with his own story and motives.