Richardson hasn't played long enough to show he is a "student of the game". Until then he only relies on his athleticism. What you don't know if he is learning to be a student. Remember when Mike Vick, Vince Young, Cam Newton, Lamar Jackson,...... were all considered the 2nd coming? For a short bit it looked like they could be but only to the novice eye.
Because they were not students of the game, DCs around the league caught up to their athleticism because their lack of "knowing the game". Kyler Murray, Jordan Love, Justin Fields, Zack Wilson, etc..... are well on their way to the "athletic back up heap".
Vick was probably the most athletically talented with Jackson close behind and Newton closing out with their athleticism extending their careers but DCs eventually caught up to them. Vick said, when he went to Philly he finally became a real QB working with Reid.
Young talented rookie pitchers come in as "throwers" in the big leagues and have immediate success 'because' hitters have not seen them. But over time IF the talented throwers do not learn how to 'pitch' the hitters will eventually catch up to them.