information about the case that Sai had to invest is related to the information about the mysterious person (which Sakura and Ino is finding). And all the evidences lead to the head of the ANBU- Kido (is a person that had a suffering childhood, his father is serious ill, but he still wanted Kido to go to school, and die because of this, therefore Kido is very possess about money), and an medic nin- Magire.