I liked him when he wasn't a god
Frankly I think the all members fighting the final villain trope is stupid and sends a bad message. Have an annoying person doing things you don't like? Gang up on him and beat him up. I'm glad Kyoryuger didn't do that. Dairanger also pretty much had Ryou fighting Sadam one-on-one.
It's blatantly NOT about bullies "ganging up on an annoying person" - unless you consider a genocidal empire to be a mildly annoying inconvenience. The place for a lone hero/star is in Kamen Rider, not Sentai (and yes, it did annoy me when Dairanger did that, but at least Ryou had something genuinely worth showcasing i.e. Keiichi Wada's martial arts skills)
In fairness to Kobayashi, she does play blatant favourites with some characters. Not usually the Red, and not to the extent of Kyoryuger, but you can guarantee that if the team features her stock "big sister/brother" figure that they'll get a lot of attention and be portrayed in a more favourable light than other characters