@goofyfoot
Another thing about the Europe 72 compilation release is that there were edits and studio overdubs added to almost all the live tracks, especially the vocals.
As far as the energy Bent added when he first joined the band, about a year ago I started listening heavily to shows from the second half of '79 and I was blown away. As far as I'm concerned, those six months or so are as good as any Dead I've ever heard. The whole band was on fire, but Garcia in particular was blazing hot. Check out the Buffalo show in November for a fine example of the period.