FRISCO, Texas — In their first three Big 12 football media events as a member of the conference, the BYU Cougars were not much more than an afterthought, a novelty act trying to make the move up in competition and prove they deserved to be considered one of the big boys of the league, let alone college football as a whole. Tuesday’s proceedings at The Star, the practice home of the NFL’s Dallas Cowboys, showed that’s no longer the case.