Strength is a tricky matter. You can get a wirey guy who's got wicked power, or a real blocky, and strong guy who doesn't have much on his punches.
It's as much about foot placement/rotation, hip rotation, strength and snap through the shoulders and arms (as well as chest and upper back) as well as range as it is about being strong.
But like Steven said, being stronger is never a hinderance.
And if you don't think kettleball squat cleans are difficult, I say, step up to the med-ball
- CJ Kim