One thing is for sure, probably not the fans Would be a TON of feints with some action between a lot of lulls IMO. Would probably go with Byrd though.
This would have been really interesting to see considering that RJJ never fought anyone that was bigger, and had an elusive southpaw style with quick hands like Byrd. Chris Byrd was a really underrated fighter with nice pure boxing skills even if he wasn't always the most entertaining to watch. I think RJJ edges Byrd with his greater offense in a dull fight.
Jones would win. Byrd was good against tentative plodders. His speed advantage disappears against Roy. He has nothing to trouble Jones. At Hevyweight Jones wins by decision. If Byrd came down in weight, he might get stopped.