There were a lot of rumours about the Boston Bruins being in on Jake Guentzel if he were to hit the free market and this could still happen, but the Lightning probably wouldn't have made the trade if they didn't think they would be able to sign him.
It was reported that Jake Guentzel wanted an 8-year contract at $8 million and reportedly the Hurricanes didn't reach that until this week, and Guentzel has decided that he can do better on the open market.