I guess id ask why you are hung up on getting the deal with seller financing?
The focus should be on getting a great deal. That may or may not come with seller financing.
Its just one option on funding.
The person has to be a fit for it but may not be. From my experience ( not sure if this is general across the board ) would be that you have a 25% chance of getting seller financing.
Wouldnt you rather go for a great deal that needs to be closed with a bank instead of marginal deal with seller financing?