It really depends on how the creator is organized internally. Regarding game development, it is very important to have a project manager.
“Ten people who see an elephant from ten different angles will give ten different descriptions of an elephant. But one person who looks at the elephant from all ten angles will be able to piece together his observations and figure out that it’s an elephant.”
But you definitely need the other 9 people as without them, nothing is possible. That means having a game editor, a copywriter, an art director, an illustrator, a layout artist (and graphic designer) and depending on the project a 3D modeler, a cultural consultant and an animator.