I don't think that Jon could sing songs like The Answer and quite a few other songs of Richie. Technically he could of course but it wouldn't sound very good.

Therefore I can't imagine Richie singing songs like Always or Open all night. He sang TAALS during the soundcheck in Nürnberg 1998 but unfortunately I missed it because I was too late. I'd love to hear how it sounds with Richie's voice, if I hate it as much as with Jon's voice. Meaning, if it's really the song I don't like or just the way Jon sings it.