Zibanejad cut it to 4-1 with a power-play goal 40 seconds into the third period.
“There's things that we do want to improve on,” Zibanejad said. “I'm happy that we have things to improve. We put ourselves in a spot to keep pushing in the second half of the season, but if things improve, that's a good [reason] for us to just keep going.”
Howden scored a short-handed, empty-net goal at 18:32 for the 5-1 final.
Vegas was without several key players, including forwards Jack Eichel (lower-body injury), William Karlsson (lower body) and Chandler Stephenson (illness), and defenseman Shea Theodore (upper body).
“That type of thing can snowball for your team, and you need secondary scoring, especially with a few of your top guys missing,” Cassidy said. “You're going to need some other guys to chip in and keep it out your net. That's what happened [the] last two games; other guys chipped in. We kept it out of our net.
“… It's a formula that's going to be required here probably until we get a little healthier, and that's OK. Other guys, hopefully, relish the responsibility.”
NOTES: Golden Knights forward Sheldon Rempal had two shots on goal in 7:18 after being recalled from Henderson of the American Hockey League; forward Michael Amadio also missed the game with an upper-body injury. … It was Marchessault’s 22nd game-opening goal with Vegas, tied with William Karlsson for the most in franchise history. … Golden Knights defenseman Brayden McNabb was plus-3 and blocked three shots in 17:25 of ice time. … Rangers forwards Artemi Panarin and Alexis Lafreniere were each minus-3.