If it works out, you're going to be working on this for 10 years.
Most founders have not managed people before, and they certainly haven't managed managers.
Here's a good rule of thumb: don't worry about a competitor at all, until they're actually beating you with a real shipped product.
Stay focused and don't try to do too many things at once. Care about execution quality.
It really is true that you become an average of the people you spend the most time with.
I prefer to invest in a company that's going after a small but rapidly growing market than a big but slow growing one.