Single post in Your Guide to 90%+ Breeding Pairs

Hello I have a question about the compatibility locking. Let's say, person A and person B give person C 2 pokemon to breed, the pokemon will show that they have 90%+ compatibility. Let's say the 2 pokemon are then given to person A. Will they still be locked at 90%+ even though one pokemon is originally from person A? Or will the compatibility move down to the 70%+ category.