In season 17 Connor perform the first 4 roadblocks and then they were eliminated. 
Hmm, that's interesting, because by leg 7, Michael had done 2 RBs and Kevin had done 4. However, before the leg's RB, Kevin says something like 'I've done 4 RBs and my dad's only done 2, so he had to do this one'.
??
That question still remains a mystery, I guess.