You must be getting mixed up a bit with the Jennings Trophy or something.
There are only 3 finalists for this trophy not 5.
Jacob Markstrom of the Calgary Flames, Juuse Saros of the Nashville Predators, and Igor Shesterkin of the New York Rangers have been voted as the three finalists for the 2021-22 Vezina Trophy
Vezina is voted on by GM's. It is for the goaltender “adjudged to be the best at this position.” not the goalie with best stats.
Why Markstrom?
The case for Jacob Markstrom: No goaltender recorded more shutouts this season than Markstrom’s nine. In helping the Flames to the Pacific Division title, he helped them to 37 wins in 3,695:50 total minutes played. Markstrom was fifth in even strength save percentage (.926) and goals saved above average (17.90), per Natural Stat Trick. His play helped Calgary finish third in the running for the William Jennings Trophy for fewest goals allowed. He is also the looking to become only the second goalie in franchise history win the award, following Miikka Kiprusoff in 2005-06.
I think the 9 shutouts was the main reason he was a finalist.. {just my opinion}