The thing about BGally is that he's a darling with people who love intangibles, grit, heart, pestiness, leadership, all that jazz. But the nerds love him too. You don't have to dive far into the advanced stats to see it:
With the notable exception of the duo of Marchand and Bergeron, Brendan Gallagher has been the league's best shot generator since coming into the league. (65.8 CF/60)
He scores well with respect to xG and WAR: He leads the league in 5v5 ixGF/60 since entering the league. Ranks 14th in total WAR (according to Corsica) among skaters over that same time period, despite lost considerable time to injury, and despite lower TOI than most other top forwards
He is almost-uniquely good at what he does. That being driving 5-on-5 offence. Scour the league, and you will find very few that are better. Historically, he has struggled on the PP, but two of his last three seasons have seen a bump in the those numbers. Perhaps a couple of blips on the radar. Perhaps just the sign of a young man learning the way an NHL powerplay operates and his place within it
He's been the Canadiens' best forward since he came into the league. Best skater they've had since the Subban trade. None of this should come as a surprise. It shouldn't be new or interesting. And yet, because of the "low-skill" style of game that he's perceived to play, he's often not thought of as the high-end player he is. His skills do not manifest themselves in flash ways, but he is indeed skilled. You don't win board battles the way he does without hands. Nor can you open up a defender in order to slide the puck across to a teammate on a zone entry. And he always makes the right play. His intelligence too does not get enough notice. If you don't make note of the frequency and efficacy of these little things he does right, you can miss it. I can recall as recently as last offseason him being referred to as a "third-liner on a good team" on the Canadiens board. His own fanbase. The people that watch him 82 times a year. But make no mistake he is extremely good, and he always has been, and he probably will continue to be for quite some time. For the next three years at least. During those years he will come to you at a laughable 3.75M caphit (obviously his agent also failed to see his value)
I do not want to see him traded. It would pain me to see him go. He's among my favourite Canadiens ever. This not me wishing for a trade, but rather my sales pitch: If he has to go you're gonna want him to go to your team. And if the price is a mid-to-late first round pick and a top-prospect, I don't think you'll regret it