An analysis by Levi Damien at Silver and Black Pride, SB Nation’s Raiders blog, shows that the Seattle Seahawks had 71 starts last season by their own undrafted free agent signings, which was 23 more than second place.
No team had more success last season with their UDFA's than the Seattle Seahawks. They had the second most UDFA's on the roster (18), the fourth most games played (148), and the 71 starts last season by UDFA's which was by far the most - the next most 48 by the Texans.
The Seahawks' total does not include Michael Bennett who was originally signed by the Seahawks but cut in his rookie season and played four season in Tampa before returning to Seattle four seasons ago.
The Seahawks only had two players on the entire roster that they drafted in the first round: Earl Thomas and Germain Ifedi. Only 24 players on the 53-man roster (22 if you’re not counting Christine Michael or Quenton Jefferson) were drafted by Seattle.
But undrafted free agents included Doug Baldwin, Jermaine Kearse, George Fant, Thomas Rawls, Mike Morgan, DeShawn Shead, and Tanner McEvoy, among others.
With the Seahawks, the first round of the draft is usually not worth paying attention to, but what happens after the draft is over is what really matters.