the guys for sure have a lot of xero related stuff in their "basements". honestly i wouldn't be surprised if one of them had one of their shows as xero recorded somewhere, and who knows what else could they hold onto - re-recorded stuff? other xero tracks? tracks that were in between xero and hybrid theory times? damn, maybe even brad/rob hold onto some really old relative degree stuff, as far as we know someone could've even recorded that show and just over time forgot about it. only time will show if we'll ever see this stuff
but coming back to that rhinestone version, that really would be a fun christmas present if you released it then, or a nice way to start new decade if you release it on 31st/1st. no pressure, tho — i can just imagine how long can waiting for a reply take.