I though it may be a rolling pocket, but if thats the case , 56 has to at least chip the DT, you cant expect a 215lb RB to block a 290 lb DT , and he didnt, he slowed him . 52 was completely beat by the speed rush and the linebacker behind the crashing DT came as well. There was a play to be made , off screen top right a receiver was running an out and the DB was playing soft . Im thinking the inside slant was not there because the mid level backer in the throwing lane.
All that said, before the play, i saw no oline communication. Maybe it was a stunt rolling pocket so they didnt want to tip it off. I think the biggest issue was players not used to olaying in those positions.