Great points.
Rice's 40-time has become the subject of much debate but anyone who ever saw him play knows he had the speed to turn a short gain into a long one, which makes him functional fast in any equation! There is talk he ran a 4.6 but there's also evidence he ran a 4.4. The reason he slid in the draft was not his lack of speed but his reputation for drops...guess he had the last laugh on that one!
Colston might not have been a burner but he was a big strong guy so there's always that thing where you think, yeah he might only have run a 4.6 40 at the combine in a pair of shorts and a t-shirt, but he probably ran a 4.6 40 in pads and a helmet too!
Eric Martin certainly wasn't fast at 4.7 but he had hands like buckets and the arm strength of a Game of Thrones beserker.