Holy shit. I don't think this tour is that much of a mess anymore:
https://youtu.be/BU8s9k0kKRs
Actually, Jon no longer sounds AWFUL for me even as a whole. His tone is still rough and he misses a note or two here and there, but he's no longer embarrassingly out of key like last spring (except for Who Says + Medicine) and doesn't sound or look like he's in a lot of pain while singing anymore. His breathing technique seems to have gotten better as well, as the whispering is much less now than it was even in South America.
His voice is still "shot", but to say it hasn't gotten any better since last spring (or better yet, late 2013-late 2016) is quite a stretch. (Watching you, Walleris!) I'm not saying he sounds great - far from it -, but his vocals are no longer unlistenable for me. He has improved; not drastically, but still.