According to Trump, Kashiwagi was up by $9.6 million early in the week. Trump noticed that Kashiwagi seemed to have worse luck when the dealers were a group of young women, so he instructed they remain assigned to Kashiwagi.
Trump noticed that Kashiwagi had a significant lead ($9.6 million) at the start of the week. He then observed that Kashiwagi performed poorly when dealt with by a group of young female dealers, and therefore instructed those dealers to continue working with him.