In terms of the Nog situation, one quote will sum it up as far as i'm concerned :
'It is what it is'
Many fans wish they could change it, Dana probably does and Nog, more than anyone else, certainly wishes he could. But he cant. It is what it is, he made a bad decision and it cost him the fight.
To be fair though, his career is in its twighlight now and he probably wont be remembered for the Mir fight. He has already built his legacy - current fights, whilst unfortunate in this case, will not define him.