The only factors I would use as stand-alone angles like that (that would not apply to all horses in a field) are those that would be sufficiently strong that they would statistically qualify as independent variables (such as the type Quirin discussed in Winning at the Races), that by themselves account for the winning percentages they produce, apart from any other variables or factors that might be present in the horse's record. Even then, though, I think there has to be consideration of the angle's winning percentage in light of the horse's odds, rather than just betting any particular angle blindly.
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