Hard Letting You Go had a confirmed drum machine on it. I'm not saying that Tico isn't playing on tracks, all I'm saying is that Jon (in the current situation) may be open minded to either going for a programmed track or leaving it out at all, if that's what would hinder the track from being released. Maybe he doesn't even envision a full band track on it, much like the story he told with Lower The Flag where they flew Tico in, only for Jon to tell him after a few takes that the drums hindered the lyrics.