To be clear, though, I'm not speaking strictly of players who come all the way through a team's academy from age 8 or whatever. The term "Youth development", at least in my opinion, also encompasses those players who you buy young who are outside the first team picture but go on to develop and elevate over time, even if they didn't start their youth career in your academy. You're still taking the time to add considerably to their personal development and, ultimately, are making the decision to add them to the first team picture. This widens the pool for teams across the league to be sure, but I still think Spurs come out favorably here. Walker, Alli, Dier and to an extent Rose would all fall into this category (and Bale too, going back a bit further). Of course I don't think the likes of Eriksen or Lamela qualify (despite being young) due to them being far more established at their previous clubs. It comes back to the question of how many teams would have bought an Eric Dier, refined his skill set, and given him a first team chance as quickly and successfully as Spurs? I'm not saying this doesn't happen at other clubs. But there are several very recent examples of Spurs doing this quite effectively.