It is,
thats the way i see it, i don't know how i can word this well lol but
Since Gorosei likes to call all place below them as Lower World and tried to stop Imu to go to Lower World because there is a drawback, the wolf bridge gotta be atleast the same height with MarieJoa at the top of Red Line.
And if I'm the mangaka and don't want to think much, since they got into the same "height", Imu can control them without Drawback lol