What happened: Aikman connected defensive improvement to Dallas remaining a contender through the regular season and into the postseason. Parker enters his first year as defensive coordinator.

Why it matters: Dallas has positioned defense as its likely trade focus after creating $19 million in cap room. An average-or-better unit would reduce the offense's burden in close games.

What to watch: Week 1 will provide the first regular-season measure of Parker's system and sideline play-calling.