Im surprised the question wasnt asked. Do you think the super champ didnt make it because of its genetics? Considering this is the only sample i think it is unfair to assume that it was the pairing that doomed this snake. I understand it may not be ethical to pair champs again but in the name of science i think it may be neccessary to give it another go and try to prove the degree of lethality associated with this combo.
Sorry for your loss. Id just hate to this combo be dismissed as possible because of the loss of one specimen to unknown causes.
Just speaking strictly scientifically.