From what I have learned from Kathy & Jos, approximately 30% of all stallions do not freeze well. Meaning, they will never produce a live foal from a frozen semen breeding. Those stallions may have fresh shipped semen that is amazing, but it is not related to frozen semen fertility. Unfortunately, the equine reproduction world is not as advanced as the cattle world…but then, we breed for performance, not for fertility.
My personally opinion, even if your boy does end up doing well in the performance ring, the amount of money you are going to have to spend to do test collections, freezing and then shelling out money to store the semen, and the lack of him being approved with any registries as a stallion, you would be much further ahead to just purchase frozen semen from a top Grand Prix stallion in the future.