We do. Because out of everyone here? The Players are the most important.

[and he says that firmly! with every ounce of conviction he has]

Judging from the trial, and based on the people who pushed Enoshima to the exclusion of other cases? I think the other Reapers may be Jacopo, Monika, Mary, Orihara. . . I'm also thinking Hortensia, for her part in Ranpo's murder, even though I don't think Ranpo was killed for being a Reaper.

Magnus was also a little too certain that Ranpo was one of us, so I suspect him, too.