An Intermediary Agent is a bad idea. It is an agent that represents both the seller and the buyer in the same transaction. See any conflicts?
How the Texas Real Estate Commission allows a real estate agent to represent both the seller that hired them and a buyer that comes along in the same transaction is beyond me. And it is beyond good common sense.
A real estate agent makes their money from the sale of a home and when they represent the seller, they are trying to recover the most amount of money they can for that seller.
A real estate agent's duties to a buyer are to assist them in making the best possible purchase at the best possible price.
The real estate agent is going to make more money the higher the sales price. The real estate agent is also going to make more money if the buyer does not demand too much of the seller or foul the transaction with diligent, resourceful inspectors. Where is the buyer most likely to receive names of inspectors? From the realtor.
If you are a buyer and the seller's agent offers to represent you both - DON'T! Either run or go find a separate agent that will be glad to take a 3% commission and have no loyalty to the seller.