I know what you mean. Everyone that I show that pic to seems to think they have seen his photo plastered somewhere before. Could just be wishful thinking though.
I think the FBI is only telling us half the story...but sometimes, that's the way it has to be, i.e., they simply wanted these pictures out there to raise our awareness level as we're getting close to 9-11 and they do like anniversaries.
I just googled “images” of the 9-11 crew and he doesn’t appear to resemble any of them...say, like a brother. He does bear some similarity to the Iran leader..AmmaDammaDingDong (Or however you spell his name.