Howell is a live-arm backup who has already seen real starter pressure. He is willing to attack and can create outside structure, which gives Dallas a different emergency option behind Dak. The tape also says he has to be smarter with the ball than his touchdown-interception totals suggest.
Strengths: Starting experience, competitive toughness, mobility, willingness to push the ball, and NFL-game exposure.
Weaknesses: Turnover history and uneven processing limit his ceiling; he must protect the ball if called on for an extended stretch.