For starters, hand timed 40s have always been suspect.
But my point is that I think the 40 is an imperfect at best predictor of success. We all saw what Estime could do on the field. To weigh the measurables over the body of work, often seems silly, at least to me. And some NFL GMs get that. I think of the Raiders who tend to draft the fastest 40 time every year. A lot of busts in that group.