Great post! I agree with all the points made in the post and I'd like to emphasize the point about "Don’t be scared to fire." Team chemistry is so important in an early stage company that you have to be comfortable with making subtractions. The word "chemistry" in "team chemistry" is perfect because building a small team is exactly like chemistry where adding or removing one substance can be the difference between two substantially different compounds. And in startups, that's the difference between a successful and a, well, not so successful startup.
Long story short, don't let a bad apple linger; even if it's a rockstar apple. It will set the tone of your startup you may not recover.