It is called the baseline. For example, when the question about MtGox's account is popped out triggers a series of gestures and microexpressions that aren't repeated ever again in the whole video.
I don't doubt that you are excellent at novelty detection.
It indicates that "something is going on", but we can't be certain the real reasons of that feeling.
Despite that, you seem to make some very direct claims.
Now I am 90% sure that the account was theirs.
When someone says they are 90% sure of something, they tend to be wrong much more
than 10% of the time. A subjective percentage estimate tends to be strongly biased by "gut feeling", which tends not to mean shit in science. I would strongly recommend against using numerical estimates outside of hard science where you have actual numerical data to base such an estimate on. You have one single sample of a magic hand gesture. Your interpretation of this one sample is almost surely biased by the fact that you had already made a conclusion before this additional data became available.
Update - Jackpot: I just found a particular gesture that is equivalent to a non-verbal confession (Thanks Adam! ^^ ).
That is hilarious. You have concluded that a particular gesture made by a particular person that you haven't met, that you don't know the mental state of, and that you don't know the motives of, has an exact meaning.
My preliminary veredict: they have definitely something to hide (probably they directly fucked up and did something really stupid/embarrasing) and they don't want us to know, but they have good intentions, they seem to really have put measures to prevent the mistakes and toughen the system, and they are pretty much honest about the business.
The problem here is that, after all that effort analysing it, I could have easily made the same conclusion without watching the video at all
. Of course they did something stupid, their fucking database got leaked. Of course they don't want you to know. Of course they're going to be honest about their business.
UPDATE: I found another very supporting sign related to it the MtGox Account, it made it earn a second "+"
Q: Who would keep 100K+ BTC in an online account?
A: Someone who trusts the site and is confident that it is secure.
Q: Who would actually trust Mt Gox, and who is in a position to assess its security?
A: The owner of Mt Gox.
I didn't even watch the video, and I already have a pretty good idea of who owned the account.