Will:

Will is definitely pissed. He's spent 2 whole seasons with Mack trying to slowly work his way up to getting to properly fuck Mack and hopefully bitch him, all without Mack catching on and getting spooked. And then his stupid ass friend (who Mack Hates!!!) swoops in and steals that away from him all because he happened to be in the right place at the right time. And anyways Will literally dibs'd Mack all the way back in college so on top of all that Leno is literally breaking Bro Code. But its all okay in the end because he can use this to guilt Mack into taking his knot whenever, and he's the one who gets to live with pretty little fresh omega Mack all season, not Leno.

Aiden:

Truly I don't think Aiden is too torn up about it. He'll commiserate with Mack for sure, and he'll let Mack think he feels bad about it. He might even feel genuinely bad for letting Mack go with Leno and indirectly allowing this to happen, at least for a little bit. But. He's always been a beta, and as much as he pretends to not care about secondary genders or whatever, Mack being an alpha always kind of felt like just another way his younger brother is better than him. And now, not only is he not better than Aiden anymore, he's lesser if you really think about it. Hockey's an alpha sport, but betas make do. Omegas do not, at least not without serious struggle. And he's not just any omega, he's a Bitched omega. So even though Aiden is still firmly in the middle of the pack in that regard, Mack's all the way at the bottom now. And maybe that shouldn't make Aiden happy, but it does.

Gabe: