All of these are Wiki entries. All are sourced though. I think the confusion (in the large part) was created by conspiracy theorists who were getting the wrong end of the stick. I don't think there's much evidence to suggest that these men weren't involved on 9/11.
so in your opinion do you believe the original list of 19 is correct mate?
I can see how average people could become confused when checking Arabic names, but I can't put forward that same excuse for the US intellginece agencies. Especially concerning such a massive event as 9/11.