Durkon is still listed as having level 13-15. Is there still any uncertainty?
Malack is currently listed as having level 11+. Have we really not seen anything to pin him down more accurately? It seems clear from the plot, at least, that he would be no lower than Durkon and with some reasonable probability as high as Tarquin. Obviously if we see that Qarr has been banished by Durkon's Holy Word, too, that would pin him down ...