To me, there is no debate on this, so let's not go down that road again. Post some vids where the DJ crosses the line into musicianship. It doesn't necessarily have to be turntablism, which is why I posted this in general and not the hip-hop section.
I'll post one to start things off. This is an Irish DJ called Jimmy Penguin. He's got carpal tunnel syndrome at the moment so he submitted this as his entry to DMC Online 2012 as he couldn't make a new routine. It's a clip from a live show he did in London: -
The backwards piano bit starting at about 1:15 is fecking cool.