Aldo wasnt even the undisputed champion. IMO for interim titles to be worth anything at all, there should never be a rematch of a unification bout. I know that's just my opinion.
You say that its because big money the fight didnt happen. Its because conor refused to fight him that it didnt happen. the man had to fight mendes who many of us including myself believed was conors worst match up. (bar edgar.)
IF at ufc 189 conor just chose not to fight and wait for aldo, what would conors punishment be? I'd imagine most would shit on him. Why should aldo get to cancel the biggest, most hyped fight of the year, force an interim championship, lose his title in 13 seconds and get a rematch?
I understand championship senority. Theses are the benefits we give anderson and joanna. But can you really say thier situations were exactly like aldos? if YOU were in charge, would you really force an immediate rematch of a fight you spent virtually an entire year promoting? When the first one ended in 13 seconds? Be reasonable now, that is a hard rematch to promote.