Zamn. Yoshi and CBIII created the entirety of FF? I should've known they were just pulling from what they made then!
Final Fantasy IV,[2] known as Final Fantasy II for its initial North American release, is a role-playing video game developed and published by Square (now Square Enix)
and

Creative Business Unit III (第三開発事業本部, Dai San Kaihatsu Jigyō Honbu?), formerly known as Business Division 5 (第5ビジネス・ディビジョン, Dai Go Bijinesu Dibijon?), is an internal development division within Square Enix. Headed by Naoki Yoshida, Creative Business Unit III develops and maintains both Final Fantasy MMOs, as well as the Dragon Quest Builders series.
CB3 is an internal unit within Square Enix, which created FF 4.

You see why your ass backwards comparison to a novelist doesn't work, I hope.
Same company. Same access to all content created by said company. CB3 is an internal team only, and remains part of Square Enix.

Hence my analogy is dead right.