it could have been recorded through the monitor line. It would make sense not to have the drums or horns. They already come through loud enough. Or it might be just the left or right pan/speaker settings of the sound board recording. The other speaker might have all the missing parts & that might be what we're not hearing.
Nice recording, thanks for sharing. I sometimes would rather hear Elvis without all horns. Brings him back down to earth, Like the, ELVIS ON TOUR, REHEARSAL FTD CD.
Maybe the leaking out of this version indicates that they will officially release the new, ELVIS ON TOUR on DVD.