Someone can be difficult from an investor's perspective, but not so with a team member. Both a team member have different personalities and motivations which m

Someone can be difficult from an investor's perspective, but not so with a team member. Both a team member have different personalities and motivations which might not align. Co-founders are probably more likely to have found an alignment, then moved forward together. Also, if co-founders are friends, they've likely learned to get over each one another's difficult spots and manage to have a bond that lets them work together.