They probably did. Zedd got butt-****ed by Gaga (wearing a strap on *****) while madeon was the bottom taking it from both Zedd and DJWS. All filmed by Terry for the Tour doc.
As a person, DJ White Shadow is not notable. Yes he might have co-produced one of the most successful singles in recent times ("Born This Way") but as a person his own notability cannot be inherited solely from that one song.
the unintentional drags... I guess I see their point though, he's never produced anything for anyone but Gaga or himself. It's not like he has some big discography to keep track or whatever.
