[Phoenix] said:
I do not add people on Steam and so forth just to say "Hey dude. You signed up for a tournament. You forgot that?"
Then you should start to. Because If you will believe every **** you're told by one person It will always lead to these kinda situations where you will get mad at by another person who's actively playing but just didn't read forums for a while.
What is more - you're the tournament organizer and even If It's not your duel you still should have some kinda responsibility to be aware of problem that happened between those 2 guys and make sure that everything is fair so people will not be writing unnecessary posts here.
If you simply cannot deal with it by yourself - then ask your friends to help you out or If you don't want to do it - then don't ever organize tournaments again. Simple as it is.