Sorry for replying so late.
The tournament is long over, but I just wanted to make this clear.
When you lose all stars in a star tournament, you will be asked to purchase stars again to continue onto the tournament. And if you decide to purchase stars (in this case, it was free to purchase stars) and continue, this isn't considered a "re-entry", and it'll allow you to keep your battle record.
"Re-entry" means when you withdraw from a tournament, and enter the tournament again. And when you re-enter, you'll lose your battle record.
We apologize that this part wasn't clear in the tournament description.
Like I mentioned in my earlier post more info and rules for tournaments will be available on the website soon.
I'm locking this topic, but if you have any further questions about tournament system, please feel free to make a new topic.