More important is the need to work with peers outside of the company - more often than not, a persons position is titled in a way that would allow them to work directly with people in a comparable position (i.e. if a "Business Developer Assistant" calls a "Vice President for Corporate Giving"). If Kul has a level of authority appropriate to "Head of Business Development" then that should be his title, even if there are only a couple of people reporting directly to him.
Nathan