Why Gordon couldn't finish?

I don't feel like going through 10hrs of instructional DVDs when even Gordon couldn't submit his opponent. His instructional make it look easy, but how come he couldn't submit Pena or Yuri? He seems to have been stuck in half guard for the majority of the match for both opponent.

EDIT: I mean technique wise. In his half-guard instructional, he make it look easy, but both matches, I just saw stalling/camping, which makes sense points wise.