That's always the difficulty.
With Mark Stone headed from the Ottawa Senators to the Vegas Golden Knights, Wayne Simmonds shipped from the Philadelphia Flyers to the Nashville Predators, and Kevin Hayes going from the New York Rangers to the Winnipeg Jets ahead of the trade deadline, the Bruins made do with a lower-tier acquisition, Johansson, who has 27 points (12 goals, 15 assists) in 48 games this season, though he has 12 (six goals, six assists) in his past 13 games.
Johansson can play center or wing, allowing coach Bruce Cassidy to swap Johansson and Coyle between the second-line wing and third-line center positions, though the Bruins appear to prefer Coyle at center for the moment.
"I think for us Marcus represents a lot of versatility and production in a top-nine role and something that we felt that coming down the stretch we could still use that," Sweeney said.
"I think adding to the depth, it's not an [indictment] of [Peter] Cehlarik and/or [Karson] Kuhlman. … I think they've done a great job and worked their way into being a big part of our group, but I think overall we all acknowledged internally that we could use a little more depth, especially knowing that [Pastrnak] wouldn't be with us for two more weeks."
As for Pastrnak, the right wing will remain in a cast for two more weeks, then will transition to a splint. At that point, there will be no more restrictions, and it will be a matter of his level of comfort as he makes his return.
"First thing he said to me is, 'I'll be back sooner than what anybody expects,'" Sweeney said. "I think he'll be perfectly fine. … I spoke to the doctor today and he feels great about where David's at."
Now it's whether the Bruins feel great about where they are. Their main opponents in the Atlantic were relatively quiet Monday, the Lightning making no deals and the Maple Leafs trading center Par Lindholm to the Jets for left wing Nic Petan.
They'll only know whether they made the right decisions -- whether they added the right pieces -- when the dust settles in April or May or June.
"It's going to be a grind," Sweeney said. "I think every team feels that way. So we've got work to do, but I'm excited for our guys and where they're at. … I think they're appreciative that we've continued to add to the group and not necessarily take away.
"We lost a good young player [Donato] by all accounts. Obviously, I'm on record as saying that, and that always hurts. But our guys are in a position of trying to win and it's a tough task. [There's a] long road ahead."