Has he even ghost produced any for him at all?

Like Geoff said in another thread, top labels use mix engineers and from what I've read and seen recently Dave Parkinson is one of the best. I'm not saying he don't ghost produce for a lot people but how do you know that John Askew didn't just send Dave his 80+ track projects that he made and mixed so that he could get an extra 10% out of them?

Give credit where it is due, but don't take away the artists hard work in doing so.