I would point to the rise of Raheem Sterling.
Pep has been very vocal about the amount of work he has spent on Raheem, a player he recognised as having bag of gile, agility, directness and pace. Sterling before Pep was a frustrating highlight-reel player, that would tend to receive the ball out wide and lose possession as a result of headless-chicken runs (ala Adama)...he was labelled a flop. However, Pep used methods such as spray-painting markings on the pitch to show where he should be in each phase of play, and the result is Raheem being the most lethal wide forwards in the league (if not maybe the world?). Sterling now bags for fun by being in the "right positions".
In Davis there is a player with all the tools needed to be a top centre-forward, he has strength, technical ability, good vision, attitude and energy. So I firmly elieve that with work on the training pitch you can mould a 21-year old player to read the game and pop up in right-positions....it all relies on the quality of the coaching (worth noting Davis has arguably not received high-quality attacking coaching), so the question is, is that do we believe Dean's attacking coaching set-up has the ability to achieve what has been done at City?