4 star for breakthrough,so this is only for spenders.

People here should have known kakuzu would be 4* with past ninjas. Last week seems to show that the ninjas with 3* that get skill books/skill trials in China have their codes added first then when Oasis is ready to release them, they will modify the requirement if they want them to be 4*. If bugs happen, the 3* requirement comes first and people that see it will benefit from it before they add the 4*.