its not necessary, but it would be interesting to see for a few shows... and russ playe on Atomic Soul quite a bit I believe.
They'd sound exactly like hte albums.
On his bio, it says that Russ used to play guitar, so I used to wonder what it would be like if Russ played Rhythm guitar while singing, but that would be kinda hard considering that some of Sym X's riffs are hard to play while singing.
I think it would sound awful, since it would cover up Lepond's awesome and intricate bass lines. It would also make the sound very muddy.
Example, the beggining of "Egypt" without that strong power chord sounds a bit strange.