Why do some players with amazing measurables not get drafted?

Was listening to a podcast the other day and this guy who owns a truck merchandise company, Brendan Schaub, talked about playing football in college. He said he benched 42 reps at 225 even though he's only 245 pounds. This would be pound-for-pound (depending on what your definition of pound-for-pound is) a performance that would blow out basically every other NFL prospect in history.

On a different episode he mentions that he also ran a 4.5 40. He also broke the record for most pull-ups at the gym he worked out at until Tim Tebow broke his record. He didn't mention how many he actually did but given his athletic accolades in other areas, I bet it was a lot.

He did say he was invited to some tryout for the Bills but never got signed.

My question is, even if he didn't get many snaps in college, wouldn't a guy with that kind of strength and speed be worth at least a 7th round flyer?