“It was like everything around him was putting pressure on him, because he knew that there was a guy like Nate Diaz that Chimaev could not control on the ground. He saw a threat in Nate Diaz. There is no doubt that Chimaev could fight Nate, but there was still danger. There was a lot at stake, so he was under pressure…”
Recall that the fight Chimaev - Diaz fell through due to the fact that Chimaev could not invest in the welterweight limit.