Where would you rank Ben Henderson among UFC lightweights?

He's now cleaned out the WEC's lightweight division convincingly and I can't see Henderson being that much worse than Edgar, Penn, Florian, Maynard, Griffin, Sherk, or Diaz. Do you think Henderson can beat all these guys and if not, who's better than him? Personally, I can't wait for the WEC's lightweight division to merge with the UFC's so I can watch Henderson and Cerrone take on these guys.