You want to think about what is the path for my first 10 or 15 employees going to be as the company grows.
Founders need to figure out what the message of the company is going to be.
The best people know that they should join a rocketship.
You really want to know your cofounders for a while, ideally years.
A winning team feels good and keeps winning. A team that hasn't won in a while gets demotivated and keeps losing.
You can basically change everything in a startup but the market.