I don't think Jon would do that ... to do a song from someone or with someone else requires either the song to be mythic or the song to be hype at the moment (mercy for example or JBj forced to do one song from sugarland at the show crossroad) I honestly think he has no interest for Richie's material ... ...but maybe if Richie was touring solo Jon may join him and then sing one of Richie songs on stage .. maybe .. IF Richie was the one on tour and if Jon joined him on stage like Shepperds bush 98

and also I don't think that if he did a Richie song ppl would scream and faint he is much better than Richie so he wouldn't steal anything it's presumptuous to imagine he would

I don't think Tico and Richie were bad guys to invade Dave's moment at the memphis premiere ... ((but maybe it means they did no harm because they are not wonderful enough to steal anything ? )) I think Richie and Tico are much more laid back and don't plan their public appearance like Jon do ..it would have been rude of Jon to do the red carpet and get all the attention but he could have gone more discret and friendly by saying a lil hello but avoiding the red carpet though ...