Because the hat was lost.

That's good. But I only see a connection with the hat. This is not enough to be certain. Meanwhile, with Rega, both clues (even if one is weaker) fit.

Added 3 minutes later

Koteiko, Neyra had the role of a servant or the daughter of the tavern owner - this role has no ND and no special features.

Or do you think these roles are very important?

I think you're already confused. Sometimes there are 11 townspeople, sometimes 10. Also, the mafia could have planted the "hat" clue in such a way that they could suspect TaCo. This fits well with why we don't see a connection with the second clue. Yesterday, I wrote a post against TaCo, where I tried to link her to the murder. That's why it was planted on her. And doesn't the connection with the hat seem too obvious to you?