Fitch and Koscheck have fought in the same weight class and company for years and never fought. Diaz and Shields fight in the same weight class and company and will never fight. Its possible.
Also you have the facts all wrong. Evans told Jones the night before the Bader fight that he was injured and that if he won the Bader fight, he would probably get a shot at Rua. Evans told him to take the fight. After the Bader fight, Evans said SEVERAL times that he was thinking about dropping to 185 if Jones won and that he didnt believe in fighting teammates.
Why would Evans say "no" when Jones tells the world that he would fight him? How does that make Evans look? In order for that to work, both fighters have to remain strong. Thats why Fitch and Kos have never fought. Every time Dana goads them about them being two top 5 WW and never fighting they stand firm and say it will never happen.
I like Jones and I think he could be huge for this sport but its clear that he and Jackson snaked Evans. Jackson wanted the best of both worlds...the new hot prospect and the established #1 contender.