Idk if Mack is his only best friend but based on how much they hang out together off the ice I think I would consider Mack part of Will's inner circle like his BC friends? Gabe spent Christmas with Will's family. Leno is his childhood friend. Mack was there saying hi to Will's family after the Chicago game before the Olympic break. They sound like best friends and there's nothing wrong with that?
yeah, i’m definitely not denying that mack is part of will’s inner circle (they spend a ton of time together, it’d be silly to pretend otherwise) what i mean is more that sometimes people act like mack is his only real best friend and kind of erase the fact that will has long-standing friendships too. he’s got childhood friends, guys who’ve been in his life way before college/juniors/nhl, and those connections don’t just disappear because he got close to a teammate.