This guy is the Imposter.
I made a thread the other week, exposing the "So who" noobs who usually tend to be imposters, and I have another good, more subtle one for you.
The scenario is, Green is innocent (we don't know this yet) and is clearly about to be voted out, then, in the last few seconds, for no reason whatsoever, Pink says "I don't think it's Green"
I would say 80% of the time Pink is an imposter this scenario. A classic trick, to make the crewmates trust you, and I'm surprised more people haven't picked up on it.