I think you guys are being too hard on Chris and Wesker. They have always been interesting, (In my opinion) just because the creators did a bad job with them in 5 doesn't mean they don't ever diserve to be recognized again. I mean I don't think they should be in this game for accurate storyline purposes, but they're not bad characters. Plus it would be pretty cool to see Chris getting that phone call or watching Raccoon city on the news in France getting blown up in a quick cutscene. (It'd be cool to see his reaction.)
As for Ada, if she's in the game I would like to kill her.