It could be that the prior buyers just got cold feet. 

What is your best source to find great tenant buyers?

You'd want to begin by getting the house under an assignable contract between you (or your entity) and the seller at a price that let's you add your wholesale fee and still provide a good resulting purchase price for your end buyer.

On the retail level we have seen a huge influx of buyers moving to Atlanta and nearly every owner-occupied sale is calling for highest and best offers.

I like single family because they are more liquid and there are more buyers (especially during a downturn).

Home buyers, now steeped in several years of rising prices and low inventory, became more selective in their purchase choices as housing affordability achieved a ten-year low. 

If so start collecting contact info for cash buyers. 

I think the buyer is milking the inspection period.

We ended up having 3 buyers interested in moving on it with one that was a little quicker to sign than the others.

So many agents focus more on the regular old home buyer.... and that doesn't always translate to understanding an investor mindset.But to answer your question you are likely looking at this backwards.