Hmmmm.... I watched the video over and over, but I'm not quite sure what led you to the latter conclusion. The early squid(s) are(/is) definitely average sized Humboldt, but on the big one at the end I fail to see hooks, making a really large Humboldt less likely. I also fail to see big diamondshaped fins, however, although I sometimes think i can see tips at one stage, halfway lost in the noise.... You're right about scale being impossible to tell, but the flow of arms and speed/momentum of movement do at least suggest something fairly large, perhaps not truly gigantic, and we could even go as far as to calculate size based on amount of lux coming from the crittercam lights and the dimness of the image...