I think it's simpler than that...
He wanted to do a last tour and he knew he was not able to play as usual so, first thing, bring sax and trumpet and a percussion full time to fill all the musical gaps and do less efforts, and second, reduce that effort as much as possible but having a competitive set.
Once Upon a time, your latest trick, on every street and Romeo and juliet are DS classic tracks, plus some of his classic solo tracks and other things never performed live would do it.
I usually have my complaints about the set, but I look at this tour with different eyes. It's the last tour he will give us, and he decided to give us a last despite he's not in the usual shape. So, thanks MK, thanks for one more tour and thanks for the two big surprises.
This tour is not one to be measured but to be treasured.