Geno Smith
If my memory serves me right, the Dallas Cowboys had a second round grade on Geno Smith coming out of college. Obviously things didn't work out then to make Smith a Cowboy, but maybe the stars are aligning for a second chance.
Geno Smith is probably the most similar to Dak Prescott out of all the free agent backup QB options available this off-season. That makes him a desirable candidate Prescott's backup in 2017.
Like Mike Glennon, Geno Smith is probably looking for a chance to start somewhere, but I don't see that happening and for several reasons.
First off, I can't remember a less fortunate QB than Smith. As a rookie he was dropped into a terrible situation with the New York Jets and unfortunately things just continued to get worse from there.
Every time it looked as if Smith was going to get a chance to prove himself, disaster struck. His teammate broke his jaw which led the Jets to go with Ryan Fitzpatrick as their starting QB. Then, when he finally received another opportunity towards the end of the 2016 season, he tore his ACL.
Smith's ACL injury likely means his market value will drop, which means the Dallas Cowboys could be able to sign him to a team friendly deal and still get a player with immense upside. Of course, Smith might not be ready until just before training camp, if then. But taking a chance on him is a risk I could be on board with.