They did good in the misdirection and establish the reasons for each suspect to be a traitor until the revelation in this episode. The fact Rin's existence further aggravate the main conflict despite the setting being mostly related tot he supporting made our main character constantly relevant even indirectly to not just the past, but the present. The fact Suguro's conflict with his father brought up trauma for Rin was so good. I love how the traitor's revelation was depicted as heartbreaking because they weren't just ally. but family to the sect.