IMO.. Clingan's foul challenges are partially influenced by refs not knowing how to call fouls based on his physicality vs what is a legit call. He's a big dude/huge wingspan.. I know we've got some big dudes in the BE but they're not as thick/large as DC. They don't ref games too often with people as big as him. .Incidental contact vs. legit call??
Not too dissimilar on how to make calls on Andre.. He's doing "stuff" defensively that refs rarely see. They're blowing the whistle in anticipation of a foul instead of letting the dude do his thing.. Frequently crazy athleticism.. Quick whistles in anticipation of a foul that never happens.