The Patriots didn't have any 4th or 5th round picks. In the 6th, they took Nate Ebner, who didn't even play football in high school. He played rugby. And he walked on to the Ohio State football team and became a special teams specialist. He was drafted as a safety but only played three snaps at that position his senior year.
Ebner's true position is a special teams psycho. He claims to enjoy the "mayhem" of kickoff coverage most of all.
Rugby players are crazy.
In the 6th round, the odds are slim of drafting a guy who will make an impact in one of the 22 regular positions. So why not draft an insane rugby player and put him on special teams? You're much more likely to get a positive contribution from him than from a 6th round RB or offensive tackle.
And maybe if the Dolphins try to get clever with some sort of Wildcat 2.0 formation, or if the Jets use Tebow in the option, Ebner can use his rugby experience to counter that. Especially the option, which is very similar to rugby plays.