Yeah, you\'r right, how fast they\'ve run in the past has nothing to do with how fast they\'ll run today.
The way you know how fast they have run first quarters in the past is basically the same as the way you know how fast they ran for a whole race-- which means all those factors are crucially important. Especially since some times the first quarter has been wind aided, or the opposite, sometimes they are running around a turn, or not, sometimes it\'s an 8 foot runup, sometimes 100 feet-- little things like that.
I particularly like that you have made this judgement without looking at the Race Shapes for, say, 50 races.