Why didn't my World Plants vs. Zombies module start with Dave?

The reason why my world plant wars zombie module didn't start with Dave:

1. My World Plants vs. Zombies module is to protect gamers from harm, not Dave.

2. Dave's modeling is more difficult. My world is a 3D first-person sandbox game. Players can freely create and destroy different kinds of squares in three-dimensional space, and use their imagination to establish and explore a world exclusive to players.