I disagree with your opinion (countering with my own anecdotal opinions/observations). I've also been to other teams practices (The fastest team I saw in practice was USC back in the Leinart days. They had great football smarts, anticipation, energy, etc.) and in my opinion, no, we don't have top 15 football speed (as a team) most years.
Also, the claims you did make that are actually evidence based were incorrect which hurts the credibility of the rest of your argument and shows you are overly biased. Example: You said Cody Hoffman ran faster than a 4.5 40. He didn't. After weeks of training for it, Hoffman ran a 4.65 at the NFL combine (and had a 27.5 inch vertical jump). ... I love Hoffman and what he did for BYU.