Ummm, I already thought about that

I edited the post, read again

Silverback has an equally-impeccable gameness quotient as a producer, with 2 sons winning extreme long-distance battles of attrition

Ponchoback (2:36)
Prime Ape (1:43)

Why did this happen? Because I bred Silverback to Sassy for one (off Screamer's brother Thunder, and therefore Duke's cousin) and Twilight for another (right off Duke)

Silverback's win record is therefore a dramatic upgrade to Duke's, being 100% (6-0) in open competition

Jack