Really?

On Sportscenter this morning, ESPN draftnik not named Mel Kiper Jr., Todd McShay, reported that USC DT Sedrick (sp?) Ellis' stock dropped because he only ran a 5.2 40 yard dash. Really? Is there a worse measure of a DT's NFL effectiveness than his 40 time? I wonder what Ted Washington or Sam Adams' 40 times were when they were taking on blockers, clogging holes, and stopping the run. Granted Ellis does not have the size of those guys and will have to rely on some agility and speed, but his 40 time is completely irrelevant as to whether he has the quick speed burst to get through the gaps and disrupt plays. The 40 has become a be all and end all of the combine, but it should really be taken into the context of the position more than the player.