We can't compare Diaby with Jack Wilshere, please.
The only things in common are the injuries.
Wilshere is a typical english boy with certanly a talented factor, but overrated by the media, overrated by fans, overrated by himself.
Abou is different.
Abou was (unfortunately was because despite he isn't finished his career, it's right to talk abou him as an ex player) the son of a football culture born in the french banlieue and developed in their technical centre.
Abou was capable to use the brain, to dictate the tempo of his game and the tempo of the game of who were playing around him. It's not a fact many great players like him, Henry, Gallas, Anelka, Matuidi, the same Mbappe, our Olivier Giroud, Benatia, Saha have started their career launched by the Clairefontaine Academy.