So there's actually one more way to get insight. So if you refuse Tad completely, are nice to chuck each time you see him, calling him sweet during his lunch, calling evandar and inviting him to the party, and if you are reluctant during the porn scenes each time; after the party you get a chance to go on a date with Abzi. If you select the bedroom option you get another investigation segment.
Letter, Watch, and necklace for the full 3 insight
but not very useful since the game ends very shortly after.
Also this path give the the Violent end #6.