UFC is now merged with WWE. Wrestling organization has a lot of money and they really can offer Ngannou as much money as he want. So one day we might have Ngannou having a wrestling match 
For those who have missed the news: World Wrestling Entertainment is merging with Endeavor Group, the parent company of competitor UFC, to form a new publicly traded company. So far I dont know what will UFC get from that merge. More tv broadcast time? New fans? Lesnar 2.0 ?
I also heard that the owner of UFC Endeavor has bought over 50% of WWE's shares and they stated that the UFC and WWE have now merged and become one container. For those who have missed the news: World Wrestling Entertainment is merging with Endeavor Group, the parent company of competitor UFC, to form a new publicly traded company. So far I dont know what will UFC get from that merge. More tv broadcast time? New fans? Lesnar 2.0 ?
I don't know whether this development can have a positive impact on the UFC or not because these two sports events are very different.
UFC is a free fighting sport that really uses self-defense skills, while WWE is a sporting event that tends to be entertainment because the fights are artificial settings or fights to entertain the audience.
But strangely there are several fighting figures who support the merging of these two sports events such as Conor McGregor and he stated that he wants to be one of the new champions.
But indeed there are some WWE fighters who become UFC fighters as well as Brock Lesnar who fights at heavyweight.