Kubiak shouldn't have to sugarcoat it, but calling out individual players for stinking in public has always been taboo, for any player, for any coach, on any team, in any sport.
If you are disappointed in Mario, then tell him during practice or during the game. There's no need to humiliate him on camera, and I've never been in favor of it.
I also think Kubiak needs to remember that it's largely on his shoulders if Mario doesn't live up to expectations. He's the one who pulled for drafting him over Bush or Young, and he's the one who coaches him. So maybe he'd better pipe down and just work on getting the team better.
If you are disappointed in Mario, then tell him during practice or during the game. There's no need to humiliate him on camera, and I've never been in favor of it.
I also think Kubiak needs to remember that it's largely on his shoulders if Mario doesn't live up to expectations. He's the one who pulled for drafting him over Bush or Young, and he's the one who coaches him. So maybe he'd better pipe down and just work on getting the team better.