He's like a faster Mata with even better movement and finishing, but doesn't dovetail with the midfield as well and I don't think he's shown much of a knack for dribbling under Simeone, maybe he'd be more expressive here.
That's a great summation of him, I just don't know if theat's what this attack is missing, there's a reason Mata plays so regularly and why Jose isn't using the Martial-Lukaku-Rashford line-up so many want, one of the 3 in behind Lukaku has to offer some control and sync with the midfield, that's not Griezmann and I think Lukaku would suit a more creative player in behind him.