Its not about that, but besides on counters or occasional bursts, he is a CM who is supposed to hold his certain congested area of the midfield, he generally doesnt advance too far with the ball ala Tevez, he is more about beating his man and coming immediately with another play or solution to a player nearby. Plus yeah he is so lanky and big that when he beats a marker (unless its counters where he is deceptively quick), it takes a while for him to get into second gear due to his big frame, that other players have time to close on him.
Plus often its becauses he lets them, in general he is bit more lax and laid back in possession when it comes to his dribbling, casual approach comes from him being technical as fvck with his footwork and INSANELY strong/ridicolously balanced, that they can barely put him off regardless of crowded he is most of the time (so often a player is basically hanging on him for dear life and he just shrugs them off). Generally not too bothered with taking immediate advantage of the space that opened up (because if he advances too far and loses possession, then it becomes troublesome positionally speaking). Besides his size, its mainly about him being a CM who does his dribbling further down the pitch (unless when he is in wide areas), while a forward like Tevez when he beats his marker generally means he doesnt have too much defenders infront of him afterwards, and pounces.