Alright, time for some revelations. Here's why I think there's some merit to Kanz's theory.
Dexter had a knife. He used it to kill the lion - it should be in whatever update KP quoted. And yet he never really showed that knife before. Never admitted he had it - contrary to the others who we know had/have a knife. Here's an additional bit of info.
Biscuit and I came to the second stairwell last night at 22:19. Dexter was already there. He was inputing the password just as we came upon the gate. This means he had arrived perhaps a few seconds before us... And yet we never saw him when we left our room at 22:07 (or at least I never got an update from Haguile on this matter, even though I've bothered him on that). It takes 12 minutes to go from the dorms to the gate; it took him 19 minutes. What did he do during that seven minutes?
I think Dexter used that time to move the body from his room to the laundry room, and then go to the second floor to get an alibi ("I was out of my room to go to the second floor").
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When you have nothing to say, quote yourself ~ Solfadore