AsthmaField, I wanted to add this question/comment:
How do you compare Donald as a 3T prospect against the following guys from the last 4 drafts.... Suh (2010), McCoy (2010), Cox (2012), Richardson (2013), Lotulelei (2013)? We've had this conversation about Donald v. Richardson and you said Donald. But to your "7-10 years" comment, I'd say there's been at least 4 or 5 in the last 4 years that I'd prefer at 3T over Donald.
I love Suh, and would take him over Donald in a draft 10 out of 10 times. However, he doesn't have Donald's rare quickness or elite speed, and if we are talking strictly as an ideal 3-Tech, Donald fits the mold more perfectly. To put it another way, Donald fits Marinelli's 3-Tech spot and Suh fits anyone's DT spot. Suh is a better player and fits any defense... however, Donald might be a better 3-Tech for Marinelli. I hope that makes sense.
Just remember, I am talking exclusively as a 3T in Marinelli's defense.
I like Donald more than I like McCoy, although I do like McCoy. He has a little more size and so would fit way more defensive schemes, but I think Donald is a better 3T prospect coming out than McCoy was. Donald's physical package (speed, strength, leverage, quickness, lateral agility) are better than McCoy's was.
I think Fletcher Cox is a nice player, but I don't see him as close to Donald. Better size for most defenses, but without the rare quickness that would make him so dangerous as a 3T. Fletcher isn't really close IMO.
As you know, I really liked Richardson last year and he was my pick for who I wanted us to draft, but while he had quickness and speed, he wasn't in the same league as Donald's. I see Donald as a physically superior player in every regard to Richardson except size. That may be important to a lot of people, but for Marinelli's 3T, Donald's size is fine.
I liked Lotulelei a lot too, but he would be a 1-Tech in this defense and while he is a really good player, it would be very difficult for Lotulelei to make anywhere close to as big of an impact on this defense as a great 3-Tech could. If we already had Donald, I would absolutely love to have Lotulelei... but needing both positions, I would take Donald over him.
I hope that explains how I see it.