Vast Aire stated in a myspace rant a few years back that El-P's ego is what really got in the way of their friendship as a whole. El-P never paid them full royalties for Cold Vein and apparently told Vordul he "uses the N word too much". He'll also apparently flip out if not given full control of a project.
I'd honestly like to see Can Ox working with different producers, El-P has made classics, no doubt. But his douchey personality really deters me from his music as a whole. Belief is an incredibly underrated producer that suites Vordul really well, I'd like to see him doing work on this LP.