These are the designs I'm gonna be using for my Standverse AU (this is a link) where all the stands get trapped in a 'purgatory' without their users and are forced to be sentient.
If Pucci hadn't left the mansion in time, would he be another enemy to the crusaders? Perhaps he'd be taken in by the foundation for interrogation? Who knows.
Kakyoin is especially surprised because he remembers enrico from his own time spent in the mansion with a fleshbud. As the only ones that were teenagers, they naturally spent a lot of time together.