From Tekken Zaibatsu Wiki
Paul was completely drained after defeating Kuma in The King of Iron Fist Tournament 5.
Paul was saddled with an enormous debt when he learned about the King of Iron Fist Tournament 6. Hoping to better his previous finish, he committed himself to winning the event to pay off his debt.
Contemplating a plan to ensure his victory, Paul came to the conclusion that prior failure was due to entering the tournament alone. This time around he decided to join forces with someone else to increase his chances of winning. It was then that Paul decided to ask his long time friend, Marshall Law, to enter with him.