I wholehearted agree with you pal
The 1974 summer engagement in Las Vegas did see some very fine performances from our man, especially the "opening night" program which saw him make some drastic changes to the set list. Only downer is he dropped it the next night and returned to the old routine
Nevertheless, his vocals were quite strong throughout, at least to my ears anyway, and he did seam interested in each performance (minus the closing night show where he did get off track a bit )
So I'm always happy to listen to anything from this period.....