Would it be a straw-man to submit that there are a number of reasons AS doesn't want to fight Jon Jones, and a big one of those reasons is likely the size and strength differential?
AS just isn't a HW. Would he be a dynamic/effective LHW? I think we can all agree that the answer is yes.
But I don't think his body at HW would allow him to do the things that make him successful at MW, and I don't think he would be able to get himself out from under any of the good wrestlers/grapplers at HW.
Unlike Sonnen, the top dogs at HW pack a helluva wallop- one or two would be all it would take.
It's a fun coversation, though.