My bet is on Amen. It's easy for Jon to sing and it's a song where Richie's absence is least significant. Because We Can doesn't make sense, even in their previous appearance, they played their more recent 'single' What About Now. And then off course, another song is a classic. Since they had played IML, Who Says and Bad Name on it before, I'd say Wanted. Although, I'd personally go for Faith if Jon can warmp up his pipes, again, it's a song where Phil can cover better for Richie. I just hope, we don't get acoustic Saturday Night or something