With only pedestrian knowledge of the signatures, the fact that they're signed all in the same pen with the signatures all basically the same size and angle - nah. Not happening. Even if you got some of the signatures at cons (which Cameron doesn't do and I don't believe Reiser or Weaver do for that matter)), this isn't indicative of the real life variance in size, angle of the signatures.
Curious what the seller's story is.
I'm sticking with my "something seems way off here" stance, but I'd wait for others to chime in. What's the seller's story on how he got these?