It’s not strange for the protagonist’s narration to be selective and vague about their thought process. To put this in perspective, we spent the entire time in Kaede’s thoughts not being told she was actually setting up a murder. The reason for this could be because she was trying not to think about that aspect.

To say that Shuichi is not hiding anything from us because ‘we can see all his thoughts’…? Yeah, fat lot of good that did for us before, right?