I just can't shake this feeling when I watch Wlad fight

I always feel like he's on the verge of being in trouble or could get knocked out under pressure. I'm always focused on that instead of the damage the other guy is taking. He always looks just a little uneasy under pressure. I'm not sure if I'm overreacting because

1) It could be result of me seeing him get knocked out by Lamon Brewster and Corrie Sanders in a 13 month span and it's stuck in my head


2) It's entirely true and that any dangerous pressure fighter of the past like Tyson or even Tua would knock him out

or

3) It's just a tall/super heavyweight problem. I always thought Lennox looked a little uneasy under pressure too. Maybe when your'e 6 foot 6 and 245 lbs it's tough to look steady and stable/balanced under pressure against another 230 lb guy. Perhaps we just reached an era where our best heavyweights occasionally get knocked out by the Hasim Rahmans and lamon Brewsters of the world.