First, like someone mentioned, it's not that Bollig is that big, it's that Tootoo is small and crouching. Second, Bollig has looked good in fights, but I wouldn't call him a heavyweight at this point. The great thing about Bollig is that he's smiling when he fights sometimes and that has to be a little psychologically intimidating.
I really like Bollig. He's not quite ready to be put in with the heavyweights, but he's a pretty solid middle-heavy. He's also very respectful, adhering to the code (you can see him stop throwing after Tootoo falls), and usually gives a helmet tap to the opponent after a good fight.
Good job by Bollig. I've seen Tootoo fight lots of bigger guys and he normally tries to out-quick them. Either he looked particularly slow or Bollig did a good job of anticipating Tootoo closing the gap. It was ugly. Glad Bollig didn't destroy him after he was down. Tootoo also seems to have come to the end of his desire to fight... not that I blame him. I felt bad b/c he was scratched the night before and likely felt he had to do it to make a point.
Bollig is a really respectful fighter, but in his fights he always seems to be laughing and smiling, like he really enjoys it. I'd be a bit freaked punching a guy in the head and have him laughing at me.