Lars is generally laughed at in such discussions online, personally i dont see anything exceptional about him. I went to the A7X / Stone Sour double headliner in Glasgow in 2010 and Mike Portnoy was absolutely outstanding.
On the subject of Joey J, i do recall a video a young lad (about 12 - 14 yrs old) posted 3 days after Slipknot released an album and he was performing the songs like a seasoned pro. Ridiculous talent for the future........
