Rare I disagree with you, and it might just be terminology. Agility is a factor, but after technique. Everything starts from technical ability, at least from a coaching perspective. By technique I mean first touch and the primary play. If your first touch is top class, football is easy, even for lads that arent agile or athletes. It is born out of the old saying the first yard is in the head.
One of the most agile players I can remember is Wanchope. He was like inspector gadget with legs that could reach everywhere. His first touch was dodgy though and he never had his brain in touch with his feet. Carrick on the other hand, or scholes, were far from agile but my good they were players. Add them both together mind and you get Maradonna...
I tell players I coach everything is about the first touch. A great one buys you half a second minimum. A good player needs less than half a second to set the next play.
I am doing 2 sessions a week with a bunch of 6 year olds who are likely academy next season. It is daft I know at this age, but I am.arrogant and dont trust many coaches to do it right. Every single thing we do is about touch and next play being forward. They are a prem league standars group, but it is mad how much they need that fundamental. Loads of dribblers and streey players, not so many 5v5 players.