Throughout the rest of the journey, Lucifer kept trying to convince the old man about how it was a good idea to divide the world into ten domains where all ten competitors could fight freely without interfering with others.
"If you divide the World into ten domains, it's much more efficient and safer. For example, instead of fighting amongst ourselves, we can focus on fighting the enemies. One of your three seeds is already dead in the last exam. I don't want to have to kill another if they interfere in my trial," he explained, mentioning about Mander to give a little more push.
The Trials this year were already very dangerous since the grandson of one of the Generals had died. If one more died like that, then questions were going to be raised on the old man. It was that concern of the old man which Lucifer wanted to exploit.