I don´t disagree with anything you said. I just hate that a character like Nikuman is destined to always "stay behind". Really, same goes for probably all of the other team members, be it Taichi, Desktomu-kun, Boob-girl or the two younglings. They won´t ever get the chance to overcome the "chosen". I remember watching Prince of Tennis, and actually hated how Ryoma would ALWAYS win. Everyone was second to him, without fail. Frustrating. I´d love to see more anime with a balanced main cast. Which is why I like Gantz, which is why I (so far) like Shingeki no Kyojin.
It´s easier to bear the "chosen one"-dilemma in straight forward shounen-series. But in anime like this one, where there´s a team, it´s easy to turn sour. And that´s what´s happening to me right now, after having watched Nikuman-kun losing to Arata. You don´t have to agree with that, it´s just how I feel about it.