Yeah, I just went back
and watched it and it is obvious the image you have is a frame picked to make him look different. The video itself is squashed in terms of the aspect ration, everything looks wider than it should be. As far as the skin tone the other Arabs in the room look that dark, too, it's a matter of light.
Another point I thought was interesting is that the conspiracy theorists always talk about how bin Laden is left handed, but in the video he writes with his right hand. If you notice the watch they also mention is also on his right hand. Most right handed people that I know wear their watches on their left wrist. I don't know why he wrote with his right hand, but then I really don't know why he does much of what he does.
In the end, if you are going to go that far with these theories... why would they do something so obvious? Why bin Laden at all? Why not invent their own terrorist group and keep the guy in their pocket? If you can engineer the kind of demolition they accuse the government of engineering, you couldn't engineer a better double and tape than that?
It's the same silly thing we get all the time. The evil powers that be are so powerful and intelligent that they can engineer impossible things, but they are so stupid they make all these mistakes. Come on. There are constant leaks out of the Pentagon and the White House. Yet somehow that is the one secret they can keep?