CAR
There is lots of potential shadow inventory but not as much as the most bearish hope there is and it is being handled in a large variety of ways such that much of it will never see the open market. It is also being doled out very slowly so as not to crush the market. A market is being masterfully manipulated.
Seconds can foreclose but if they are sold out (i.e. completely underwater) they get nothing and lose their right no pursue for deficiency because of 580b (the one action rule). If the 1st forecloses and the 2nd is purchase money they are SOL. If the borrower declares BK they are SOL also. If it is a recourse loan they can hang out there and some day try to collect on an unsecured loan which aint the eaisest thing in the world to do. They are generally better off getting whatever they can today and most understand that.