The vibes I was getting from Jon's performance is that he was trying hard to tap into his 2008-2011 stage persona (or whatever you wanna call it) which is why he looked somewhat awkward because Jon didn't want to make a fool of himself at a fellow musician's concert.

This is the maybe the 2nd time Jon has decided to revert to how he use to act on stage,you like how Jon was between 2008 to 2011 where he looked like he actually enjoyed himself onstage and was actively moving around the stage. Rock in Rio 2019 being the 1st time.