If you've been friends for a year that's probably enough. And since a successful startup is going to take at least 3-5 years (more if you're really successful), you're thus turning 3-5 years into 4-6, which is not much different.
YC companies are quite diverse these days and many require as much, if not more, non-tech work and understanding as deeply technical work.
thanks. is there any reason it is not now time to add this point of data to the application. definitely a question i as well as many others have wasted thought cycles pondering. though i do like the privilege of having access to this information.