It wont be a major problem, UFCs so dominant that apart from Fedor no one else could really claim to be the No1 in their weight catagory outside of the UFC, and you can understand why from a busniess point of view, UFC is the biggest org why risk one of their stars losing outside the UFC when in reality they can make just as much money keeping things in house
barnetts not there because of the slight issue of PEDs
Fedors issue was money, control and Dana being well Dana (ie a pri*k) he insults fighters who arent under his org then trys to land them a few months later, works with most of them but Fedor told him to stuff it...