Future guy can't be anyone we know, because there just isn't enough reason and backstory behind it. Future guy needs/needed to be an entirely new character, and his reasoning should have been built up over the series. Kind of like how the story of the Shadows was built up over the B5 arc. Instead we just get your typical James Bond type bad guy; "Because I can!". Even Berman himself admitted they hadn't decided what to do about Future Guy. Doesn't give you much confidence in the foundation of the series, eh? Enterprise would have been much better if Manny Coto had been there from the start. No disrespect to Berman and Braga, because they already receive too much flak, more than they deserve considering they HAVE done/taken part some good stuff over the years, but I think Coto would have brought the right kind of ideas to the table, which would have then been developed - Much like the way Season 4 has been handled.