"And Jack, for me, is just a young guy. It's about, can he handle the physical part of the game?"
While Frederic has been playing on a line with Backes, Cassidy has looked at both Forsbacka Karlsson and Studnicka with Marchand and Pastrnak. It's not an easy spot for any player not named Patrice Bergeron, but also will give Cassidy an early idea of the future for those two prospects.
It could also be injury protection.
The Bruins got impressive production from center Riley Nash in Bergeron's spot last season when the regular top-line center was injured. But Nash left as a free agent, signing with the Columbus Blue Jackets on July 1, and the Bruins believe Bergeron should be ready to start the season after offseason groin surgery, there are never guarantees.
"It would help if we need to go that route; I'm not saying we would force a guy in there, but it's a bit of long-term, bit of short-term playing them with those high-end skill guys," Cassidy said. "Then just trying to see if they can play with those types of players because we feel we have very skilled wingers up and down the lineup. Not as established as Pasta and March, but guys like [Anders] Bjork, [Ryan] Donato, [Danton] Heinen, [Jake] DeBrusk."
That's why getting a feel for all of the centers is so important, whether it's in Boston or in China, whether it's early in training camp or later on.
"We need to see glimpses of it, that at least they can handle parts of it and not be completely out of their element," Cassidy said. "So far they've handled it well."
And while the coaching staff might be ready to head back to Boston, to get the entire team together at a full training camp, Frederic isn't nearly as ready to rush home. He's enjoyed this experience in China and has made it work for him, finding his way on and off the ice.
"We're staying in nice hotels," Frederic said. "We're eating well. We've traveled pretty well. It's been a good experience. Going home will be good as well. I know guys are probably missing some people back home. But it's been great. I could stay longer."