If you don't think Marcus Smart is tough then you haven't been watching enough Marcus Smart his entire career, college included. Guy scraps and claws every possession, has gone into some of the toughest environments in sports (Allen Fieldhouse in particular) and led his team to victories (did that as a freshman, mental toughness for days). There are other ways to measure toughness than to just be like "Oh he got carted off for a sprain what a pansy", especially when he's essentially the franchise cornerstone at the moment and they are trying to be extra cautious.
It's the typical hockey mentality applied to all sports around here. It just flat out doesn't work. Sorry, you won't be seeing Bergeron's in other sports. Hockey players are just a different breed.
Smart doesn't back down. He's the first guy in the gym, he gets on the floor for balls, he doesn't let critics dictate his game (evidenced by the MUCH improved shot). He wears charges and just flat out competes. That's more than tough enough for me, especially from a 20 year old kid playing against grown ass men.