Rielly was minus-4 last season and minus-13 or worse in each of his previous four seasons. This season, he's plus-7. He is also tied for first in game-winning goals (two) and first in overtime goals (two) among defensemen.
"Things have changed, players have changed and the way we play as a team is different, and that tends to impact guys in positive ways when the team is better and you feel comfortable with the group and the coaching staff," Rielly said. "That can really have a positive influence on guys."
Rielly, who averages 22:10 of ice time per game, leads the Maple Leafs in total ice time (509:43) and power-play ice time among defensemen (2:41 per game) this season. He also often gets matched up against the best players on the opposing team.
"He's coming, obviously, he keeps getting better, he's still a kid," Babcock said. "It's hard to be real consistent and real good defensively and offensively every night in the National Hockey League when you're a kid on the backend."
Voting totals (points awarded on a 5-4-3-2-1 basis): Morgan Rielly, Maple Leafs, 55 points (five first-place votes); John Carlson, Capitals, 37 points (two first-place votes); Mark Giordano, Flames, 34 points (two first-place votes); Brent Burns, San Jose Sharks, 29 votes (two first-place votes); Roman Josi, Nashville Predators, 21 points (three first-place votes); Seth Jones, Columbus Blue Jackets, 19 points (two first-place votes); Ryan Suter, Minnesota Wild, 16 points; Thomas Chabot, Ottawa Senators, 16 points; Kris Letang, Pittsburgh Penguins, 7 points; Ryan McDonagh, Tampa Bay Lightning, 5 points (one first-place vote); Victor Hedman, Lightning, 4 points; Tyson Barrie, Colorado Avalanche, 4 points; P.K. Subban, Predators, 2 points; John Klingberg, Dallas Stars, 2 points; Drew Doughty, Los Angeles Kings, 1 point; Erik Karlsson, Sharks, 1 point; Dustin Byfuglien, Winnipeg Jets, 1 point; Keith Yandle, Florida Panthers, 1 point.
NHL.com correspondent Dave McCarthy contributed to this report