I agree with all of this! Lamar only ran as much as he did under GRo cause that was GRo's playcalling that depended heavily on Lamar's running ability and skill. Lamar actually mentioned that Monken is giving him the "keys to the offense" in his presser today and that's completely different from GRo's system. Monken's "aerial" system should fit him well and allow him to only run as needed (i.e., as you mentioned above and if there are open lanes to do so, or if the pocket rapidly collapses to extend plays, etc.).
This is a new offensive scheme for the offense and Lamar, which he called, "Smooth" today at the presser. He knows that the Ravens need to pass the ball more to keep up with the other high-profile passing teams in the league (i.e., the Chiefs, Bills, Bengals, etc.). He's said that time and time again. GRo kept him bottled up and he did well with what he was allowed to do but under Monken, I am expecting him to be extremely freakish through the air. I can't wait!