It's truly a masterpiece in the end afterall, while they might not know much about humans at the start...Curiosity can evolve into obsession very quickly, whether it's healthy or not is something that can only be determined by how it follows after and I think it's a very enjoyable fact regarding Caphet...Because there are many humans that he just couldn't let go, they were too...
Wonderful...
Perfect...
It would be a waste to miss such specimens of the species he encountered wouldn't it?
And unfortunately it seems like he didn't quite get it until the very end where it was WAY too late for him to realise and lose the last human he had...
While I opted for the idea of nicknaming him Caphy, ending a name with y is normally meant to be more...Adorable, which some can argue that it's hard to debate on whether It is adorable or not...So Caphet is better for neutrality and uniqueness :)