Responses
He is both. He is innocent, yes. And he is also naive and acts without thinking.
If you read the novel you know that Josh and Emma really look alike and that Chase even knew Emma's family name.
You also know what it takes for Chase to find out that Josh is an omega, and how many clues he actually had.

Y’all saying Chase is dumb is so funny, because if you actually read the novel, you’d know he just lacks education about sex—he’s even a virgin when they do the deed like, the novel really shows how innocent and clueless he is, not stupid.