Not in terms of being the best unreleased song of LP, but talking about the "rarity" of the song, I would say the "holy grail" is Ricochet (talking about studio tracks). I mean, Mike (and the band / label) were pretty upset about the leak of What Are You Worth and Mike genuinely thinks Brian Howes is directly involved with the leak, so releasing Ricochet would be giving credit to someone Mike don't want to (so, the only way to get Ricochet would be another leak, or wait if the things will clarify someday).
BTW, I remember at the time about a Reddit post and someone called Walter Daniel, which was "ripped from all the internet", which was the responsible for the leak in some manner (he had a CD with WAYW and other song from other artist). As LP management knew about this guy, this could prove the inocence of Howes? Really don't know...