That's possible, but I think it also could have been part of an effort to simplify the offense for Rocco by giving him fewer options and decisions and fewer jobs to do. It looks like it worked well.
The guy probably needed more real life, in game repetitions to get experience, knowledge, confidence and also get better chemistry with other newer players while the OL has also had to work to find their footing with a new coach etc.
Simplify, find strengths, expand.
I'm just not convinced it's any more complicated than that.