I would put Jackson's Hank on that list. He produced 6 or 7 3xwinners or more in 5 breedings before he died in the prime of his life. Unfortunately, the only dog from Hank's production that really got anywhere, production wise, was Jocko. Without him being bred to the Yellow John bitches, he wouldn't be where he was either.
I would also vote for Tombstone for what he accomplished being bred to 7 bitches, and a line of dogs has revolved around him for decades. That line has evolved into the backbone of many high powered dogs even unto this day.