Why specifically a rogue?
Although I also tend to lean towards this version.
It seems to me that our scientists are dead.
A suspicious type visited the morgue, rummaged around the body of Reinhardt, and appeared and disappeared as unnoticed as he came.
Precisely because of the phrase "appeared and disappeared unnoticed." And one scientist is definitely dead, the other may have been sitting in his office. Or he is also dead.
Added 1 minute ago
And a manager probably visited Hermit for an inspection. And Vish-Cachek defended him.