Here are some thoughts on the move:
Jennings is fast, and that's the most important part of this deal. Cincinnati lacks speed on defense and in the secondary. The Bengals lost their best pure athlete in Johnathan Joseph in free agency. Jennings can be the speedster in the secondary Cincinnati needs.
Jennings is a former first-round pick with a lot of starting experience. Therefore, he can step in if Leon Hall or Nate Clements is injured. Cincinnati doesn't have a lot of experience on its bench behind the starters. Adam Jones is a former starter but is out with a neck injury.
You also wonder what this means for Jones. The Bengals traded for an experienced veteran less than two weeks before the regular season. That could be a sign they're not optimistic about Jones' chances early in the season. Jones had a second neck surgery in June. He may be a candidate for the physically unable to perform list (PUP) to start the season.