On Cook's run he has a clean cutback lane to to the right and the blocker come in the clean up the defender.
On Davis's run, the defender is unblocked and there is no cutback lane because the right side of the line has collapsed.
Cook made an incredible move on the second level that isn't in Davis' arsenal, but the difference between getting stopped at the line there is more of a story of offensive line play than anything. Torrence failed to get to the second level to take on the blocker on Davis' run, so he's virtually out of the play. On Cook's run, he makes it to the second level to wall off the defender. That's the difference.