I fully agree with you that Usman doesn't deserve the shot, but the fight itself interests me from a stylistic POV. Islam will not be able to outwrestle Kamaru, Kamaru may well be able to outwrestle Islam, and Makhachev will be forced to stand up with a guy who doesn't get tired for 5 rounds. Islam's great, but that is a tough fight for him.
Obviously Shavkat, Garry, Prates, etc deserve the shot way more, but if the fight with Kamaru happens first I won't necessarily be heartbroken... unless this is the fight where Usman's knees both just give up and explode!