I really do believe Jon *is* getting better, if probably not as much as some people would like/hope. But listen to Who Says:

https://www.periscope.tv/FireTheCanon/1YqJDDgygoAJV?

I haven't seen him sing it this good for a couple of years now. Though David (?) and someone else sing along in the verses, he seems to hit the higher notes again or more easily as has been the case in 2014/2015...