It was absolutely scheme and mentality first. By far. No question. Josh didn't need to work on footwork. When established QBs like Wilson, Rodgers, Brady, etc have a bad game plan, get pressured, and have a crappy game no one is questioning their footwork. Their footwork sucked as a result of the aforementioned failings. They're not going back to their footwork fundamentals.
That analysis was a day late and a dollar short. Just a regurgitated cliche from Allen's first few years. We're past that now.