They are going to sign a major Western artist or artists.
Take a look at YouTube for example. Some Western artists are already starting to emulate certain moves and promotional tactics that K Pop groups use.
In this case, BTS is the biggest K Pop group out there, and arguably one of the biggest groups period right now.
So by association, a lot of these tactics are associated with BTS, and if some of these artists outside of Korea, and even in Korea,
want a slice of the BTS pie , you have to go through HYBE/ Big Hit and why dilly dally with all the red tape when you can just sign with the label itself?