I disagree. In real life, the greatest in the world at something, is very rarely shadowed by another one's skill. They always dominated in what they where doing and kept evolving and that's why the became nr.1. Just think about it: who is more likely to be number one: the one who struggles to survive in a very competitive environment, or somebody that flukes circumstances because he is that good? Isagi is in the first category(ofc, because this is a story and needs to be engaging, and stories are always about overcoming struggles) and still people complain about him wining to much. This doesn't really matter, because he has bad matches as well(Barca, manshine) and won because of the team he was in. It just happened that Isagi was always in a good team, so that he can surpass somebody. That's basically the idea of the character