My opinion is that the ones that have substantial equity are not part of the “must sell” inventory and these will not budge on their prices. They do not need to sell their properties and will do so only if they can realize substantial gains. Otherwise they will not bother.
Fortunately it’s the foreclosures, which is “must sell” inventory, that will set the comps.
The transactions that don’t materialize (i.e. sellers taking homes off the market or having prices too high) are totally irrelevant because they have no effect on the market comps.