UFC Fight Night: Maia vs. Usman (also known as UFC Fight Night 129) is in the books and did not have a particularly exciting main event. According to Fightmetric Kamaru Usman has a 100% score in takedown defense. This is not the opponent Demian Maia should be fighting on late notice.
Demian Maia had his first MMA fight in 2001. That is 17 years of training in striking arts. He has decent speed and technique but no power (maybe because he does not commit to punches). In order to develop punching power, all strikes in training must have the intention to hurt your opponent.