Vocals: Russell Allen
Lead Guitar: John Petrucci
Rhythm Guitar: James Hetfield
Bass: John Myung
Keyboards: Jordan Rudess
Drums: Mike Portnoy
Bro, this reminds me of a whole other big question. In the past years, there have been so many people claiming LaBrie is DTs "weakest link" right now and the most likeable band member to quit the band or not be able to perform at some point. So one question my best friend and I constantly talk about is who'd make the best replacement for vocals in DT. Russell Allen would be an interesting choice. I think anyone would gladly go ahead and do it no questions asked. I think my personal favorite would be Ross Jennings, but that would mean splitting up Haken, which I wouldn't want since they are my favorite band by far right now.
I got into DT with I&W back in '92, primarily because of Portnoy and LaBrie, but especially LaBrie. DT was one of three or four bands for me when it was the LaBrie/Myung/Petrucci/Portnoy/Rudess model. I was all in; all the singles, all the Ytsejam releases, first day buyer on official releases, etc. When Mike left, they became a great band, but one of many for me, and I staggered my buys, I only saw The Astonishing because it was different (they literally played across the street from me in Philly on the ADTOE tour and I didn't go; it was for other reasons, but I suppose I can officially say "I wouldn't walk across the street to see them!") but I'm still a fan.
If LaBrie left, it would have to be the PERFECT replacement, and while I would give anything a chance once, there is NOTHING I've heard to date from Russell Allen or Ross Jennings - including the latter doing DT for the Shattered Fortress show, which I was at - that makes me excited for that, or makes me think they are the perfect replacement.