Another thing that I notice is that Jon's tone has gotten extremely thin when compared with even 5-6 years ago. Even in the late 00s (Lost Highway tour) and to an extent through to the Circle Tour - his lower/mid range still had a good tone.
I mean here - it's not 1993 or anything, but he still sounds listenable singing this song (and not all powerless and feeble sounding).
The first verse (with the lower vox) sounds OK (although noticeably thinner), but the second verse ("Baby I want youuuuuu") has a really thin and feeble tone.
Is that from damage? Not working on his voice? There's hardly any resonance in that 2015 clip.