IMO Manning won't change our in division stuff that much. You watch we will still split most of the in division series. The difference will be the games will be more opened up. Chargers will be coming to town with a gameplan geared to score more, because they know Manning will put up more points then Tebow did.
Its good for the whole division for all the teams to improve. Time to make AFC west a feared division again, instead of a laughing stock.