He wasn't 7th, he was 30th at 3.58. 5th was Saros.7th most goals saved above expected in the entire league last year.
4th best GSAE/60 in the league last year (min 41 games played)
He had the 33rd best rate.
There are also teams in the NHL that didn't have a single goalie that played 41 games. 20ish games is more than enough of a sample size for a goalie.