Well since your whole reasoning behind saying
Jacob is Dharma
is based on the fact that the video has the line

Then you pretty much have to talk about the video.
You make a lot of good points and you may be right.
I just don't think there is enough evidence to say the connection between Jacob and Dharma is a fact.
Check out this from the season 3 finale:
Quote:
ALEX: You locked Karl in a cage. You put him a room and tried to brainwash him.
BEN: I didn't want him to get you pregnant. I suppose I overreacted. We better get going.
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Ben definitely used the video to attempt to control Karl. Who's to say he hasn't used it before to try and control others?
Also you asked:
"And how could the others alter it? That is a bit to far fetched IMO."
Well......
The others brought Juliet to the island.
They apparently kidnapped Locke's dad and brought him to the island.
They were able to supply Jack with a video of off island current events.
They purged the Dharma Initiative and took over the entire island.
Juliet and Ethan performed operations on "other" women trying to deal with the whole pregnacy problems.
They have detailed files and background info on the losties.
They have/had people that can operate a submarine.
If they can do all this then a little film editing shouldn't be a problem.