Wow, that is very, very depressing. I didn't start getting into JOP until a couple years ago cause I felt a lot of resentment towards the various side projects of former Savatage members (seriously, if Jon, Zack, Chris and the other guys have enough time for all these solo bands
and TSO, why can't they do a Savatage album/ tour?), but once I gave them a chance, I realized that JOP is actually a damn good band. I don't buy into the whole "Savatage: Phase 3" thing, but they really are a great band in their own right. All their albums are rock solid, but Maniacal Renderings is a true thing of beauty. Matt was such an amazing player, I think it was truly a miracle that Jon found someone to play with who was so close to Criss' style and proficiency.
This kind of makes me wonder what the future of JOP will be. Even though it was Jon's band, Matt was such a huge part of creating their music and sound, I have difficulty believing that Jon will simply find another dude. I always got the impression that the big reason why JOP lasted as long as it did was because of the chemistry between Jon and Matt, and it gave Jon a vehicle for his really heavy music that he didn't really have since Doctor Butcher. Without Matt, I'm not really certain is JOP anymore. Damn shame too, I really wish I had gotten into them earlier so I could have seen them live.
RIP Matt