BYU just isn't able to recruit enough speedsters. BUT, BYU can recruit the Tight End/Linebacker type player who is "fast and athletic for their size". Thus you get guys like Matthews, Houk, Hoffman, Jordan Leslie, Ross Apo etc.. Players who can cause mismatches with their combination of size and speed.
This year those players would have been MLP, Bushman, Neil Pau'u. This staff would do well to focus on those types of players as well.