The idea is that you knock the receiver off his route and disrupt his momentum too?
I don't find it surprising they are slow to react five yards off as the receiver is at a full sprint and the DB must back peddle or turn his hips to keep up. Advantage the guy running a fly route at full speed, every time.
I, unlike a lot of fans (not including you here), think the coaches are probably competent and have reasons for not playing tighter. I'm just not sure what those reasons are.
I'll just add this thought...
The Andy Janovich story shows that this staff is willing to change up. And look at Davie and how they made adjustments. I think my sentiments in this thread probably echo the staffs thinking. I got an idea... how about a reporter just come out and ask Riley point blank? He's shown that he'll more than answer the tough questions.