Everything from basic paperwork to taxes and even procedures can be better when handled by two people.
A lot of home seekers (including real estate investors) use the services of real estate agents not just for getting good deals but also getting them quick.
Generally, more the motivation of either side (buyer-seller), lesser is their negotiation power.
By having more than one person involved in the investment of real estate properties, you will be able to set your goals, keep standards and move forward in the business.