Usman agreed to fight Chimaev because of the huge payout. This is natural because Usman has won in negotiations. This defeat was also beneficial for Usman because it could be assumed that Usman lost this fight due to lack of preparation. Chimaev has been training for months at the training camp, while Usman has only started preparing for the Training Camp in just 11 days. And one more thing, Usman has received a very large fee from the UFC (I don't know how much) to fill this fight.
https://mmasalaries.com/ufc-294-salaries-and-payouts/ here are the numbers. Dont know if they are real, but if they are, then no wonder why Volk and Usman accepted those early notice. PPV sales also made a solid addition to their totals. I am just curious how they figures sponsorship amounts.
The guy with freaky eye - Sharabutdin Magomedov, might be not so familiar for you guys, but in Russian mma and pop-mma he was kind of a star, so my media is full of him due to UFC debut. Numbers say that he got only 20k+4k that night, but recently he said in the interview, that he has spend almost 70k on his preparation for UFC debut, and he is kinda broke already, because he had no fights for almost a year.