I d like to make 2 points here. (bout the ellen show)

First, all the other microphones were really low in the mix. If the voices of the rest of the band were at least 70% of the volume level of Jon, his absence from some parts would not be recognized. How stupid was this mixing? + on both songs. Like noone cared inbetween performances to go tell the sound engineer to put the backing vocals louder.

Second and on a positive note: I get a feeling that part of the problem is psychological here. I mean about the voice. Sure he was singin really bad lately but I m with the person (Symbeline?) who said that the nasal days are gone. I think it could be that he just needs training and confidense. It is really strange guys but it could be that the voice problem is more psychological than u think. My hint for that idea is that on occasion he did sing correctly and rather nicely some small high parts.