The idea should come first, the startup should come second.
The company just needs to see you as like this maniacal execution machine.
You really want to know your cofounders for a while, ideally years.
It's difficult to get large groups of people, to the extreme levels of focus and productivity that you need, for a startup to be successful.
When lack of structure fails, it fails all at once. What works totally fine from 0-20 employees, is disastrous at 30.
Why couldn't it have been done 2 years ago, and why will 2 years in the future be too late?