Barron has had a nice start to the 2021-22 season, scoring two goals in his first two AHL games. The 22-year-old has one goal in five career NHL games and will take Kaapo Kakko's (upper-body) spot on the roster.
Perfetti was the No.10 overall pick in 2020 and spent the 2021 season in Manitoba (AHL), where he had nine goals and 17 assists (26 points) in 32 games. In his debut, he will skate on the third line with Adam Lowry and Jansen Harkins.
Scheifele will serve the final game of his suspension that was handed down by the NHL during the postseason for his hit on Jake Evans. With Scheifele out for the season opener, Paul Stastny is expected to centre the Jets' top line and Pierre-Luc Dubois should see time on PP1.
Jonsson-Fjallby was claimed off of waivers by the Sabres last week but quickly returns to Washington. The Capitals were the only team to put a claim in for Jonsson-Fjallby, so he was eligible to be sent to the AHL. The 23-year-old winger had 10 goals and five assists (15 points) in 31 games with Hershey last season.