Maybe he thinks since he can hang with the best wrestlers i.e. Jones in the octagon he can manage with his own camp.
Thought IMO this is also a great risk. MMA is evolving and so in 5 years from now who knows how current skill sets will stand up. The safest route is being close to where the evolution is being pushed.
Maybe Gus could make more money from a business point though. His name will be huge in Sweden and he can start and run gyms here plus attract a lot of international talents.