Yeah he is/was infinitely more talented than Jones and Smalling and a far more natural defender than Stones; this was him at 18 before Wenger got the chance to sabotage him in the same way he did Walcott, Ox, Jeffers, Ramsey (to a lesser extent) etc....
His only ‘weakness’ is his pace, but Terry and Vidic both got exposed in that regard a number of times, and his early performances in these videos, fresh from working with Pochettino, he neutralised that with good positioning and reading of the game.
As recently as last season at Boro and in the summer for the u21s he was immense, then naturally playing once a month in a system that makes quality, experienced internationals like Koscielny and Mustafi look woeful as well has taken its toll on its form.
He’s got the talent to be Alderweireld-like but he needs a regular run of games under a proper manager; next to a defender with pace, he could play at the very top level.