"Whether I moved [Reaves] up or moved people down," Yeo said, "that's up for debate."
One area of Perron's game Yeo liked in particular was seeing signs of aggression in after-the-whistle incidents. But he knows that won't be enough to help the Blues win, that he and Berglund need to find the back of the net at some point to provide offensive support for players such as Steen, Vladimir Tarasenko and Paul Stastny.
"We need them, there's no question," Yeo said. "I think they can be a real huge factor in this series going forward. I think they have more in their game as far as getting into the offensive zone, getting in on the forecheck, being physical, making life miserable for their defensemen. I think we can do a better job of that. I think their line in particular can do a better job of that."