Barzal, 20, one of two first-round picks (No. 16) by the Islanders in the 2015 NHL Draft, played two games with New York before he was sent back to Seattle of the Western Hockey League.
"It was unbelievable," said Barzal, who was held without a point in those two NHL games. "Just seeing these guys every day, meeting all the players and getting to know them, they're all such great guys. They work so hard. They're here for a reason, and I got to see what it takes day in and day out."
In hindsight, it appears sending Barzal back to the junior level was the right move; he had 79 points (10 goals, 69 assists) in 41 regular-season games and 25 points (seven goals, 18 assists) in 16 playoff games, helping Seattle to the WHL championship. He was also named WHL Playoff MVP.
"That was a good year, learning how to win, winning a WHL championship," Barzal said. "Going on a long playoff run, withstanding the grind … it was great for my confidence and for what's to come in the future, hopefully.
"Obviously at first, it was tough going back. Not playing and that kind of stuff, I don't think that's good for development. They thought the same thing. I thought I made the most of my year in Seattle. I had a really good year team-wise and individually, so I was happy with how things went."