This is pretty interesting. Rory Dodd doing IGLHFBOU, I'm thinking that it was a vocal guide for Meat but it says on facebook that Jim did all the production and left the vocals for Meat and Stephen Galfas to finish.
Meat added some more guitars which makes it a better song for sure. As far as the vocals go I still would take Meat's over Rory's for this song. Rory is a great vocalist but he is lacking something that Meat delivers.
https://www.youtube.com/watch?v=uNsLLNWFL1A#t=250