I beg to differ that NYC Serenade is musically challenging (not even his most challenging - Jungleland is more complex.) NYC is essentially four chords repeated infinitely (with a little bridge). One is a minor 7th, so it sounds exotic - out of place in his usual Heart and Soul 3 chord C/F/G cannon. Don't get me wrong, I love the song. It's beautiful. But it's not Supper's Ready.
Now, if you're talking about Davey Sancious' intro? That's another story. But Bruce had nothing to do with that - and Roy never comes close to it.
All that said...this Chicago show is an excellent release. Couldn't be happier that we keep getting these amazing shows month after month. He's yet to give me a reason to stop buying them.