Rolled yes. But not rolled above bc.
I always go by the rule that if I want a bc foal thrown from 2 rolled horses, I go at least one full stat rolled wise above bc before I breed them. I tend to get better foals from parents with hellishly low percents. For German Warmbloods, to get bc foals I wont breed anything below Incon Str and Incon intel, because that helps insure a bc foal.
Breeding 2 bc foals together, especially eventers, doesnt always insure a bc foal, usually they will be at least one stat off, if not two, which is about where your foal is. If the horses you bred had Phen str and incon intel, you would have had a better chance of getting a bc foal.
Sometimes we get lucky and stats roll during eventing, which makes it easier
