So essentially, the winner of this week's tournament becomes next week's bounty, with a ten point reward, should that players show up, correct?
If so, that sounds like something configurable via the prize tab. Create a new prize, bounty on player. I suggest that you lock it, just to be safe. Amount - Non-monetary. Points=10. Click OK and you should be set to go.
If I've got this wrong, please let me know