They both scratched to a doa dog at the same age. But you're right he was always the top dog and hasn't been put under pressure like his brother. He pretty much blew through everything.
But then I factor in his traits. He is off (SuperStar/Ch Blonka) both parents were out of high percentage litters themselves. From what I've seen in him and from my knowledge of both families, since I have 2 siblings in SuperStar and Little Secret(both tested game) and 3 siblings in Ch Blonka, Ch Buddy and BullsEye(stolen)who had high abilities, into the equation, I think highly of his gameness.