Another difference is that while it is not an average of secondary market transaction data, it is derived from an underlying market that remains sizeable. This is in contrast to some unsecured interbank markets, the basis of LIBOR, which have generally shrunk substantially since before the crisis.
Also, since banks are committed to lending to companies with BA lines based on CDOR, and because borrowers choose when and at what maturity to borrow, it is less likely that these rates would be subject to the problems I discussed earlier.