Seguin and Marchment have played together for much of the season, but the coaches have been scrambling to find a third player who fits on that line. The top line of Jason Robertson - Roope Hintz - Joe Pavelski has been pretty consistent, and a line that includes veteran Jamie Benn with two youngsters in Wyatt Johnston and Ty Dellandrea has also played a lot together, so it makes sense.
Dadonov offers options on a lot of lines.
He also can be a solid contributor on the second power play.
"He's been an elite bumper, middleman, for a while in this league," DeBoer said of Dadonov's role on the power play. "He brings us different dimensions there."
Dallas has one power play goal in its past eight games and ranks 31st in the NHL in power play success at 10.2 percent since Jan. 1 (21 games). Any help on the power play can be a good thing.
Dadonov will likely draw a few of the same assignments that Gurianov did, which could mean a boost in a lot of areas. Gurianov, 25, was taken 12th overall in 2015 and played 257 games for the Stars. He has struggled to score in recent seasons and has just nine points (two goals, seven assists) in 43 games this season.
"Denny was a big part of our team," Nill said. "In the end, he just wasn't producing any more. He's an offensive player, great speed, great skill, and it just wasn't working. The last couple of years have been very inconsistent. He's a young player and eventually you have to make decisions."
The fact Montreal was willing to retain half of Dadonov's remaining salary is indicative of the value they think they can get in Gurianov.
"Denny is an intriguing player," Nill said. "He's got a lot of ability and we've all seen that. He can turn a game quickly, and he's still young. In our business, we have to make decisions, roster-wise."
The Stars are hoping this is the right one.
"I'm excited, really excited to play here," Dadonov said. "I think it's a good team, always hard to play against, so it's a step forward for me and a great opportunity."