They're seeing the speed first hand and have seen plenty of other players run 4.3s so they probably had a good idea that Worthy could run a 4.2. Can probably make good predictions for any players 40.
wow I watch this now and see Ewers struggling so much. He anticipates poorly and really cannot FEEL the pocket. The talent is there but the instincts are not. He has acknowledged his injury prone reality and will be the best QB on the shortest leash this upcoming year. Arch brings the intangibles needed for a title run. Ewers can be great, but he is not a champion.