He's had no problem showcasing his well-rounded skill set during the WJSS. In United States White's 7-5 win against Canada Red on Tuesday, his strong forecheck forced a turnover behind the Canada net, and he found Quintin alone in the right face-off circle for the game-winning goal.
Then in the first period against Sweden on Thursday, Jack (5-foot-9, 157 pounds) got the puck from Quintin in the middle of the offensive zone in traffic, took a hit and scored with a hard, low, off-balance shot.
"Very rarely does he surprise me because I grew up with him and I can pretty much tell when he's going to do," Quintin said. "But there's always these plays where I'm like, 'Wow. Did that just happen?' "
Prior to this week, the brothers had played together in one organized game.
"Quinn was in his minor-midget year with the (Toronto) Marlies and they called me up two years," Jack said. "He would have been 15 and I would have been 13."
Quintin remembered the game because Jack, of course, stood out.
"I was a little nervous for him because he's playing two years up," he said. "All these guys hit puberty and he [hadn't]. He ended up scoring that game."
Quintin long ago stopped being surprised at Jack succeeding against older competition.
"Since he was 3 or 4 years old, he was always the best," he said. "He was the kid in novice who would have six goals and could lift the puck before anyone else. He was pretty much ahead of the curve from the get-go."
Jack knows what's coming this season after watching Quintin go through the draft process last season. That's why despite all the talk about him being potentially the No. 1 pick in the 2019 draft, he has a relaxed mindset heading into another season with the NTDP.
"I don't really see it as pressure," he said. "I know there's a lot of great players in the draft, so it's going to be competitive. But there's so much time. The draft is a year away. I'm not too worried about where I might go. I'm just worried about my game and how I'm playing."