A hider had flipped. I think you believed Alco was town, and you knew your own alignment. There hadn’t been a rolecop flip and scum always have an investigative role - so I think it was feasible to work out he was non-town. Obviously he played well to deter suspicion and deserves credit but his tracker claim was very shaky. this isn’t pinning blame on you for not working it out, more just pointing out that it was something you could have worked out in the same way the “dumb” players could have done better