I disagree. Obviously you've seen a lot of Thiago, but that's not how United are likely to fit him in. A team like Real or Bayern would probably have to play him as the AM, because their CM pair are always deep-lying, very defensively sound players. United, however, tend to go for a pair of complementary box-to-boxers.
Thiago has more than enough defensively and tactically to partner Carrick behind Kagawa (or Rooney, if you're that way inclined). Certainly he's more dependable in that position than Cleverley, Anderson, Giggs or even, in a way, Jones, all of whom we played there last season. (Jones is obviously an excellent defender, and is good in a man-marking role, but I've never thought he understands the midfield anywhere near well enough to be an effective conventional DM/CM.)