I think he will definitely drop a bit, Mayock opinion doesn't mean nobody likes him but it does reflect the opinion that he just isn't a hard worker and did poor in his interviews. Mayock has access to GM's and I'm sure it isn't his opinion alone. I don't think there is any way he goes top 10 but he will still likely go in the 11-20 range but a team will have to wonder what type of player will show up every game.
On talent, he is mid 1st. The UNC stench, and his own less than ideal attitude will drop him further, but I dont see him falling out of the 1st. He would be too good a 3-4 DE for the Ravens, the Steelers and the Patriots to all pass him.