I don't know why that's true, but I know that it is. A lot of people can bench 400, 500 though is unusual, and to my mind, utterly impressive.
It doesn't mean you're a better football player than somebody who benches 'just' 400 though.
I like Ellis and I think that unless we trade down, the only real value at the top of the draft defensively is D-line. So move up or move down - impact d-lineman or LB/S/CB and extra picks.