I proclaim that Alain Mendez (aka Hisui) is the detective. The detective is not the culprit. No proof is needed to show this.
I recently listened to the podcast review on the 2 Guys and a Mic podcast of the Umineko no Naku Koro ni anime. It was a good review but Jahmere and Mike only watched the anime. That is not a crime. An anime should be able to stand on its audience needing to lean on supplemental material or the original source product. The anime leaves out some major plot points and explanations so it makes sense they were a bit confused at points.
There is a distinct reason that the anime has the bad reputation it does.
In hopes of shedding a little light on the situation I decided to throw out some blue and red statements to clear up some things.