Great question! "Procuring cause" questions involve a lot more than just who was the agent who showed the house. There must be an initiating event which leads - in an uninterrupted fashion - to a successful closing.
One way an interruption happens is when an agent "abandons" his/her client. That is, if the agent fails to stay in consistent communication with the Buyer, it may be determined by an arbitration panel that the Agent abandoned the Buyer.
Another question asked in Arbitration is how the property was initially discovered. If it is true that you found the property on your own, then it may be such that the first agent you engaged might not be able to claim that they are/were the "procuring cause."
There are a multitude of facets to these discussions, and lots of relevant questions to be answered to provide a satisfactory answer. The result is often impossible to predict.
Here's a link to the Indiana Association of REALTORSÂ® Arbitration Guidelines related to Procuring Cause in case you're interested: http://www.indianarealtors.com/Education/ArbitrationGuidelines.aspx
Good luck in your efforts!
Principal Broker, REALTORÂ®
MacDuff Realty Group, LLC