Talk:Kishou Arima/@comment-27247962-20160321221530/@comment-26409128-20160321235436

If it's like that then how does Hide know that? A part-time shouldn't know that Arima likes to test ghouls.

It's here It's not from when the manga ended but a few months after. There are a lot of theories that may or may not be viable and it's pretty long. You can easily find the part about Hide and his involvement in the Anteiku Raid, though.

I also found another more recent theory about Arima's blindness which I think is very interesting  It could also still tie together with the Hide and Arima theory in a way. Kaneki had to try extra hard because Arima did not hold back since he did not realize who it was. Therefore he was "worthy". Or something like that.