Regarding interests, Leonard Ethan's attitude has always been that what is rightfully his must not be diminished, and what is not his, he will not take more. Therefore, in this negotiation, he naturally chose to weigh each detail carefully, striving to gain every bit of benefit.
Of course, Ethan knew that he had made a sensation this time, and the reason Greece didn't want to pay money was that they were really out of funds. So, he naturally wouldn't choose to be stubborn and insist that the other party make a cash commitment now.
After all, insisting on this point at this time will not only affect the relationship with the Greek government but also provide a way for the other party to manipulate the payment method if they genuinely take a stand, such as extending the payment time to a century.