If you want something in a deal, just ask for it.
Great execution towards a terrible idea will get you nowhere.
If someone is getting every decision wrong, that's when you need to act, and at that point it'll be painfully aware to everyone.
You have to find a small market in which you can get a monopoly and then quickly expand.
In YC experience, 2 or 3 co-founders seems to be about perfect.
You have to be decisive. Indecisiveness is a startup killer.