Great Prince Charles's invitation served as an acknowledgment of Marvin's explanation. Though he didn't explicitly say so, the opportunity was there for the taking, and Marvin was keenly aware that the Great Prince was putting him to the test.
If Great Prince Charles hadn't visited the Nightingale Club today, Marvin would have submitted a membership application, asking Sir Sander and the others for their letters of recommendation to join first and then make contact with Great Prince Charles.
However, not only did Great Prince Charles come today, he also personally approached him. After some back-and-forth, Marvin managed to preliminarily achieve his goal.
There was no need to present the letters of recommendation today.
After participating in the golf tournament the day after tomorrow, it wouldn't be too late to apply for membership in the Nightingale Club.
