While we technically "own" the old notes, we have no rights with respect to them, except that if Prosper closes for whatever reason, we can expect (ok hope) that the servicing rights to "our" notes would be transferred. However, we have no other rights of ownership on the old notes. We can't purchase defaulted notes and try to collect on them, we can't expect that our selection of collection agencies will be honored, we can't expect that Prosper will inform us of the status of collection efforts, we can't expect that Prosper will inform us of the status of bankruptcies and payments in ch 11 or 13 situations, and we can't contact the borrowers or collection agencies ourselves.
While I don't have any new notes, it appears that the only difference is that if Prosper closes, the new notes will be unsecured assets of Prosper, and will go, first, to satisfy Prosper's secured creditors.
In other words, I fully agree with Mark.