I understood what you were saying, I was answering the other comments as well as you own.
It is obviously each to their own. I'm just not a fan of the 1976-77 music, I know I will get lambasted for this, but here it is.. I just don't like 'Unchained Melody' or 'How Great Thou Art' yes there is power but it is uncontrolled in my opinion. When I listen to a song like 'Surrender' this is Elvis being able to show how versatile and what a master of his craft he could be.
Elvis singing live in 1976-77 doesn't compare to anything from 1972, just listen to 'American Trilogy' this is a power song in the same genre of HGTA but is controlled in a far better way IMO
To say Elvis still had it up until the end simply isn't true, yes there were glimpses but sad to say he had long since past his peak, which is a shame because I believe he was capable of much, much more had his health improved.