So, basically Iruma-kun is Bob Ross when he paints.- "So you won't discard anything?"
- "Right! I won't discard anything."
No, he wanted to avoid having another Delkira because he hated that Delkira just tossed his status a a guide to the side, he didn't like not being useful. He wanted someone that he can mold to surpass Delkira, but you're right that he almost glossed over Iruma because of what he believed that meant.Mephisto kept trying to look for the next Delkira that he almost missed the first Iruma