It’s true that Kos has turned from average to top quality in a few seasons, but if Wenger is such a genius at turning average CB’s into great ones, then why hasn’t he done it more often.
The fact that since the top players like Adams, Campbell and Keown, we have had, Senderos, Squillaci, Nordveldt, Djourou, Cgan, Sylvestre, etc, and plenty of other uninspiring CB’s.
So it would suggest that maybe he hasn’t got any special talent for bringing through players in that position, and Kos was the exception rather than the rule.
As for the other players you mentioned, Cesc and RVP were considered the best young players in Europe, so it was hardly a stretch of the imagination that they would turn out ok.
Since we sold RVP, we have bought several strikers, like Chamakh, Gervinho, Park, Sanogo, Campbell etc, and none of them, apart from maybe Giroud, have been anything more than average, even though their wages would suggest otherwise.
I don’t think Wenger is any better than a lot of other managers at bringing through unknown players.
He was when he first came here, but not any more.