So there's a pretty high chance Zam was told by his team to claim specifically watcher
Basically someone on scum was like "hey Zam why don't you just be a dear and claim watcher and then some town might counter you and then all we lost was vanilla but we found the watcher"
this trade probably benefits scum, tbh
It's exactly what we tried to get Prof to do in Phoenix Wright mafia when he was under suspicion day 1. just claim cop! but he was too lazy
or tony is scum watcher and they assume town wouldnt have one and now tony gets "town cleared"