I also noticed this guy earlier, before Cyber and Carina get on, but the most suspicious stuff I saw I didn't get in a demo, and while demoing I could find nothing conclusive enough to confirm my suspicions, so I gave up (I was also getting rather hungry, and tired). Judging from what I saw I would say that he is indeed guilty, but lacking significant proof, I have mostly my word on that.

I don't have time now to watch the demos... I have a demo of my own, but I'm not sure what is in it, I'd have to have a look at it to see if it is of any use.