Look at the stats Justin Fields and Jalen Hurts are putting up. Two qbs similar in style as Lamar. Both dangerous rushers, Hurts a better passer, defenses know to keep an eye on them but they still run wild.
Not Lamar any more, why?
Not the offense, more so the passing threat. Teams are still playing man against them, so running is easier, and they are not trying to prove that they are pocket passers.
My pt, a lot of Lamar's issues are in his head, he tries to stay in the pocket too long, hesitates to run too much, so when he does, a five yard gain at best.
All three teams now run a similar offense as ours, save for better pass combinations....