According to
FoxSports.com:
From 2006 to 2010, Oregon State averaged 4 TEs, 9 WRs, and 3.6 RBs (Not FBs?).
From 2011 to 2013, Oregon State averaged 7 TEs, 8 WRs, and 4 RBs.
In 2014, they had 7 TEs, 17 WRs, and 10 RBs.
(Langsdorf left right before the 2014 class signed)
Unless 2014 was a fluke, to me these OrSU numbers tell me that Riley and Langsdorf's offense was evolving and they wanted more TEs, WRs, and RBs on the roster to run their offense.
2017 NU has 6 returning TEs plus 1-3 recruits in this class. (7-9 TEs total)
2017 NU has 15 returning WRs, plus 3-5 recruits in this class. (18-20 WRs total)
(5 scholarship and 10 original walk-ons)
2017 NU has 9 returning RBs, plus 1 or 2 recruits in this class. (10-11 RBs total)