Blackmon is. Trinnaman is a legit sub-4.5 sec. 40 yard, 10.82 100 meter guy. He'd be the second fastest guy on BYU's roster right now (behind Davis). I expect him to be a much more dynamic player than Devon is.
Like I said...I love Devon...he's a solid D-1 player and a great person. He became one of my favorite players on this team when I saw him stay on the field well after the rest of the team was in the locker room, taking pictures with fans, playing catch with kids, etc. after the Boise State game. Devon is awesome, but, I believe Jonah has the tools to be a big-time receiver for BYU.