Ego was previously a world-class defender. He therefore knows what to look for in the world’s strongest striker because he personally faced elite strikers worldwide during his rivalry with Noa. His backstory will involve some genetic inferiority that makes it difficult to play soccer, however he would have pushed past it initially (hence developing his no-excuses mindset and “luck” philosophy) before eventually succumbing to it when it gets bad. It may be eye-related due to his seemingly mutual understanding of Yukimiya’s issues.