There are two questions to ask, and attempt to answer, as part of the immediate reaction to Mike Sullivan being hired as coach of the New York Rangers on Friday.
What can Sullivan do for the Rangers, who failed to live up to expectations this season, missing the Stanley Cup Playoffs after winning the Presidents' Trophy and reaching the Eastern Conference Final last season?
What can the Rangers do for Sullivan, who for all of his success with the Pittsburgh Penguins, including back-to-back Stanley Cup championships in 2016 and 2017, could not get them to the playoffs in his final three seasons before mutually parting ways Monday?
"If you have goaltending, which he does, that's one huge component of it," Brian Boyle told NHL.com. "If you make the life of the goaltender easier, then that's an important component too. You just need your top players to not disappear. That's a challenge."
Boyle's perspective matters here. He played for Sullivan when the coach was an assistant with the Rangers from 2009-13, and with the Penguins in 2021-22. Boyle works part-time as a Rangers analyst and broadcaster on MSG Networks. He also works for NHL Network.
He knows Sullivan. He knows the star players who have thrived under Sullivan, namely Sidney Crosby, Evgeni Malkin and Kris Letang with the Penguins. He knows what the Rangers didn't do last season. He knows what Sullivan will bring to them.
"'Sully' is still unbelievable of making sure everybody knows exactly what is expected of you," Boyle said. "If your role changes, he's great at communicating that. He is a demanding coach. He's an extremely fair coach, a very respectful coach of the players, but also still very demanding. I think that's what makes a coach successful; understanding your personnel and figuring out a plan for that group to have success is what he does best. All the coaches in the League know the game extremely well, but he knows his players extremely well and puts them in places where they're going to succeed and the team is going to succeed. That's his gift. That's what separates him. That's what has given him success."
So that answers the first question. At least partially.
There's also this:
"When we would go on win streaks or when we were on losing streaks or not playing our best, how he would approach meetings, it was all the same," Boyle said. "This is what our objective is today. This is what we're going to do today. We're not talking about yesterday. We're not talking about tomorrow. He is tremendous at staying on target all while having a plan. Now it's going to help him a lot if some of these stud guys are already in the gym trying to get better because there are some of them that, quite frankly, aren't. He's going to demand it because his camp is not easy at all."