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In chapter 904 it was shown that there were Blackbeard's Blackbeard men. That little open our insight that after the time skip power from Blackbeard is quite extensive.
But why this one yonkou territory can expand quickly after about 2 years? Here are some reasons:
Almost all are afraid of him
The strong reason is that almost all pirates fear Kurohige. We know that the strongest paramecia-type devil is in Kurohige, which is Gura-gura No Mi who used to belong to Whitebeard. We know that Whitebeard was the strongest man at the time while still alive and using this power.
Then, perhaps the strongest human epithet turned to Kurohige? Of course it is possible, given that Kurohige ate the devil's fruit and the crew of Kurohige was the crew of choice from the 6th level prison.
Take over all the Whitebeard area
This one theory is very popular among One Piece fans. Since it is considered the remnants of Whitebeard led by Marco are defeated, although the war has not been shown, of course automatically Whitebeard's dominion will shift power over Kurohige.
Is it possible that the purpose of Kurohige is the domain of power alone? Apparently yes, given that the main purpose of Kurohige is to look for strong devils. Thus it seems that the relationship between the dominion and the powerful devil fruit is directly proportional. The wider the area of power the wider the chance to obtain strong devil fruit.