Founder mode is essentially a simple choice: when faced with difficulties, do you choose to solve the problem immediately or pretend you didn't see it / run away? Any employee can have founder mode, but a founder may not necessarily possess it at all. Rational people will make the choice that benefits themselves the most. While a team may desire it, they don't actually need too many people with founder mode. In the future, ten such individuals could definitely build a unicorn company.