"He came in almost completely self-sufficient," he added. "He had to learn the pro game, obviously, but habits-wise, work ethic-wise, teammate-wise, he didn't have those little things you had to teach him along the way. He had those innately in him. Things like how to be a good teammate, how to work at practice. He didn't have any of those growing pains."
That's not to say Gallagher had a blemish-free record as a rookie. He recalls at least one lesson in preparation - and sun safety - he had to learn the hard way.
"I remember one time I enjoyed the sun a little bit too much down in Florida. Michel Therrien called me in before the game and I had a sunburn. I thought it was going to be a jokey meeting," shared Gallagher. "It wasn't a joke.
"I had a sunburn on my face and he said, 'Did you prepare? Did you get ready?' And the answer was obviously, 'No.' It seems silly but it's all part of it," continued Gallagher, who finished his inaugural season as a finalist for the Calder Memorial Trophy, given to the NHL's top rookie. "As a young guy, you learn little things like that, like if you spend the day in the sun, you're not going to have the energy that you normally have. I learned a lot from him. There were no grey areas. He understood what got you going and every once in a while, you had to hear from him."
Right coach at the right time
Gallagher has had a chance to learn from four different head coaches during his time in the League, from Therrien to Claude Julien to Dominique Ducharme, and now Martin St-Louis. With every new bench boss came a new opportunity to grow and learn.
"All my coaches came at good times in my career. Michel Therrien was the perfect coach for me as a rookie," said Gallagher. "He made sure that I wasn't on the ice in situations where I was going to be in trouble. He protected me. And then as the season went on, you start to earn the coach's trust, and he starts to put you in positions where you earn more responsibility from him. It was never given, you had to earn it, but once you earned it, he wasn't shy to put you in those positions. He gave me every chance to succeed.
"And then Claude came in. Our team was dipping at the time, and he kind of kicked our confidence back up. And for me, he put me in a position where I was playing a lot with Pleky [Tomas Plekanec] and I played a lot with Phil [Danault]. Playing with that type of centerman was really beneficial for my game. I was put on the ice against some of the best players in the world and then me, Phil, and Tuna [Tomas Tatar] became a really effective line in terms of controlling the game, and we enjoyed that challenge and that opportunity that was given to us by Claude," recalled Gallagher, who led the Canadiens in scoring during Julien's first full year behind the bench in 2017-18, his first of two 30-plus goal seasons with the Canadiens.