I would think Jay Weinberg also cause what i read around.

about the bassist, it almost confirmed that Alessandro ‘Vman’ Venturella, who has worked as a guitar tech for Mastodon, Fightstar and Coheed & Cambria. Venturella also plays guitar for the band Krokodil.
Side by side, the left hand of Venturella matches that of Slipknot’s current bassist (see above). You can see the skull and spider design on the back of his hand, while the letters on the man’s knuckles read “DETH.” See a full shot of Venturella in the Facebook photo below