A less facetious answer. This is the subtext of what thanking MP for a song he didn't play on or write is.
"We'd also like to thank the guy who threatened to hold our careers hostage for an extended period of time, who then, when told that was unacceptable, left the band, and spent several months creating passive aggressive drama on various social media outlets. We'd also like to diminish the value of the performances of the drummer who replaced him in the band and actually performed on our two Grammy nominated songs."
The Grammy nod is for The Enemy Inside, not the entire career of Dream Theater.