Brendan Gallagher is leaving one rebuild near completion in Montreal to help embark on another in Vancouver.

The Canadiens will retain 50 percent of his $6.5 million salary cap hit and $4 million actual salary, a league source told The Athletic.

Brendan Gallagher is leaving one rebuild near completion in Montreal to help embark on another in Vancouver.

Brendan Gallagher, who has recently been traded from the Montreal Canadiens to the Vancouver Canucks, shared the key to a successful rebuild and is eager to bring a winning…