*shakes head*
Where to start, where to start.
First of all, that last picture you posted is not a Giant Squid.

Giant Squids, and their cousins the Colossals, have NEVER, EVER been seen in the wild alive. The closest anyone has gotten, would be the worlds leading GS researcher Dr. Steve O'Shea, who actually capture baby Giant Squids which died in captivity some hours after they were brought to the surface.
Vampire Squids are quite different, they look nothing like Giant Squids.

And also, no Giant Octopus has ever been seen, living or dead. For awhile it was assumed that one would wash up on shore every now and then, like the GSquids, but it has now been proven that these huge rotting globs are actually whale carcasses. When a whale dies it's body lies suspended in the water, until it's flesh rotts away leaving nothing but blubber and bones. The bones sink and the blubber floats, and washes up on shores.
5 points to the first person who explains the main difference, disreguarding the bigger size, between a Colossal and Giant Squid.

It has been suggested that the colossal squid is the larger and more lethal of the two, but theirs no real evidence to support this. Though the giant squid could hold its own in a battle.