To be honest, it was something we have seen coming for some time now, but were uncertain as to exactly when or how it was going to happen because, as everyone who has ever met him knows, his communication skills leave much to be desired. That being said, he simply didn't feel the need to talk to us about any problem he was having or discomfort he was experiencing with any situation in particular.
For the past year it has felt like we were playing with a drum machine or a pre recorded backing track. He completely shut off communication with us, contributing only to the band when onstage and opting to take no part in any social activity while on tour or to be present for the filming of our upcoming DVD. Whatever his reasons were, he simply was not a part of us anymore mentally or emotionally.
The person that fills the vacant shoes Ratboy left is going to be more hungry and more intense and bring a renewed energy to the stage, not simply be able learn the songs and repeat them for a half hour every night.
You can find the rest of the statement here.