I haven't really been following the edit that closely over the years, but doesn't it seem that the F1 is always one of the bach/b'ette who gets a 1:1 relatively early in the season (within the first 3 episodes). We know that Graham was Deanna's F1, but he didn't want her so he left. Jason had Melissa right out of the shooter. Jillian had Ed the 2nd 1:1 date. I remember in Andy's season, Tessa had an early date as well; actually, didn't she have a few dates?
Anyway, just a thought....any insight?