ZWK
Footballguy
Greg Peshek tracked routes run for some players in the 2013 & 2014 draft classes. Sammy Watkins (2013 season) ran the most screens out of the receivers that he tracked - 57.4% of his targets (or maybe it was of his receptions) - and still managed to average 11.2 yards per target on the season. 8 other WRs that he tracked also had over 20% screens. Here they are, along with Treadwell, sorted by YPT:
%Scrn Player Season YPT
57.4 Sammy Watkins 2013 11.2
31.6 Stedman Bailey 2012 11.1
26.2 Brandin Cooks 2013 10.3
27.6 Allen Robinson 2013 9.6
45.8 Jordan Matthews 2013 9.4
33.9 Tavon Austin 2012 9.1
24.1 Markus Wheaton 2012 8.8
25.6 Quinton Patton 2012 8.8
??? Laquon Treadwell 2015 8.4
30.0 Keenan Allen 2012 8.4
So running lots of screens doesn't prevent a receiver from having a very good YPT, and Treadwell is near the bottom of the barrel in YPT even compared to WR prospects who ran a lot of screens. The only other guys below 9.0 YPT are Wheaton & Patton (who haven't been that good in the NFL) and Allen (who had lousy quarterbacking, and was above 9.0 YPT in 2011).
%Scrn Player Season YPT
57.4 Sammy Watkins 2013 11.2
31.6 Stedman Bailey 2012 11.1
26.2 Brandin Cooks 2013 10.3
27.6 Allen Robinson 2013 9.6
45.8 Jordan Matthews 2013 9.4
33.9 Tavon Austin 2012 9.1
24.1 Markus Wheaton 2012 8.8
25.6 Quinton Patton 2012 8.8
??? Laquon Treadwell 2015 8.4
30.0 Keenan Allen 2012 8.4
So running lots of screens doesn't prevent a receiver from having a very good YPT, and Treadwell is near the bottom of the barrel in YPT even compared to WR prospects who ran a lot of screens. The only other guys below 9.0 YPT are Wheaton & Patton (who haven't been that good in the NFL) and Allen (who had lousy quarterbacking, and was above 9.0 YPT in 2011).