You seem to know better already. In your early days, the more you can avoid known pitfalls and issues, the better. So you must avoid taking this person in. Othe

You seem to know better already. In your early days, the more you can avoid known pitfalls and issues, the better. So you must avoid taking this person in. Otherwise either you and/or your co-founder may quit in frustration because of this person, and leave this whole idea behind as a bitter experience. To go from inspiration and excitement to a bitter parting of ways would be terrible. Avoid this from happening, and also the possibility that one day you may write a blog post about how you ended up making this wrong decision and how it hurt you. :)