>>23576725
Mochizuki simply liked sci-fi so he wanted to do a show where the team consisted of aliens with a high emphasis of space, so he decided on a constellation Sentai but wanted to avoid focusing on horoscopes or chinese signs to avoid overlap with Saint Seiya and wanted to keep the story progression and villains to be complex in order to avoid making the show feel like Go-Busters.
Then when thinking of how to be bold in a simple setting he tried analyzing the original season and decided that since Goranger means 5-ranger, he should just increase the number which led to Kyuranger. Then he made the grave mistake of choosing Mouri as the head writer because he liked his episodes in Gaim.

God why did Kobayashi have to recommend Mouri and Shinomiya. In fact what did Kobayashi even praise about Mouri? At the very least I know that Shinomiya was the apprentice of Carranger's head writer Yoshio Urasawa so I could see how she would find that impressive.