Von Miller, a player used more as a blitzer than a pure linebacker, weighs 237 pounds.
Jason Taylor, who was a sacking machine, weighed around 245 when he played even though he was listed at 260.
Chris Clemons, the DE for the Seahawks, is listed at 255.
Cameron Wake is listed at 258.
Yeah, Dion Jordan does seem a bit lanky for a DE, but that's the first impression that scouts had for Jason Taylor. Yeah, it would do Jordan some good to put on some muscle. But to say that he won't make it in this league if he doesn't weigh enough is not only a bold statement, it is wrong.
Year in and year out we see players who were "too small" or "too short" that make it in this league. Players that are deemed undersized until you measure their on-field production, heart and playmaking ability. Jordan still has to prove himself at the NFL level, but he was the #3 overall pick for a reason.