I commented in another thread that the raw field capture score has a 1/10th decimal place. I think putting it to use would be a good answer. Say, 15 troops to capture goon 1 drops 10, all hit map room. Goon 2 drops 10, 5 hit map room. Goon 1 scores 0.6 field capture. Goon 2 gets 0.3.