Rob, completely different kind of tight end. Davis is fast, almost like a slot TE. He is a great blocker and requires double teams. You can line him up all over the place. Ertz is more possession, using height to advantage (see: Gronkowski). His speed is fine but not special. But his height and hands make him a difficult match-up. We use a tone of 2 TE sets. If Walker is gone, Ertz would make a lot of sense. He isn't as fast as Walker but has other match-up advantages.