@Rye-Sco One thing studying statistics has taught me is that data can be skewed by factors other than what is obvious. For instance, is the fact that MnK must perform more functions with the left hand than a controller player taken into account? Movement on MnK may be more broken, but requires much more coordination than controller? How about reflexes of controller players versus those of MnK? We have only two forms of input to judge against each other so naturally one will be higher than the other due to various factors, to say it is only aim assist that is the factor is making a large assumption about the data.
It is my personal opinion that MnK and controller should never play against each other anyway since both can have unfair advantages over the other in certain situations. I had one person I know was probably on MnK in mixtape doing tap strafing and crazy movement while shooting me at the same time from the air getting a perfect shot. Controller can no longer tap strafe after the change was made. (With the exception of the switch joycons that can tapstrafe by flicking the controller).