First, 'prototypical' is a designation for a player who meets certain physical/athletic standards for what a Defensive Coordinator wants to accomplish. My understanding of the Marinelli 43 is that the majority of the line are guys who can explode into the backfield to create pressue on the QB, the one exception being the 1 Tech DT, whose purpose is to prevent the QB from being able to step up into the pocket while facing a double team, usually the Center and Left Guard. Your DE's should be technically sound enough to adjust to the run and maintain gap integrety while also setting the edge against the run or using his overall speed to get around the Tackle to the QB. You can get that job done with a lot of different characters, but it is preferred the guy has some speed to ensure the Tackle is never comfortable. Personally, I look for guys between the weights of 250 and 275, with some length to them (6'4" or taller) with exceptional 10-yard speed. For the purposes of my response on this thread, I used 40 times no higher than 4.6, because I could not find a site that documented 10-yard speed.
Admittedly, 40 times can be misleading, particularly with Defensive Lineman because they rarely have to run 40 yards to make a tackle. But it's a safe assumption the guys with good 40 times also have the best 10 yard times but that's not always the case. I'll stick with the list I provided earlier, because you have to be careful about assuming that a guy who is slow but still had success in college will maintain their performance in the slide to the pros. The speed of the game changes exponentially because only the best of the best make it to the pros. Given my understanding of the Marinelli attacking 43, we will have to agree to disagree on your belief that all of those guys would make good additions. Many of those DE's are actually more ideal for the 34, because their responsibility is to gobble up Offensive Lineman to give the Linebacker's an opportunity to make a play.
