These two should be true for an incubator/accelerator or group of advisors/mentors/investors. At the end of the day, the founders build the company, not anyone

These two should be true for an incubator/accelerator or group of advisors/mentors/investors. At the end of the day, the founders build the company, not anyone else. "Outsiders" (those who don't actually work in the company) should offer guidance and frameworks, but never a definitive solution to the problem you're having, that's for the founders to figure out and decide for themselves.