WHile there were points during the return to Bankstown where the aircraft descended at or close to 1000 fpm, for the most part the rate was more like 700 fpm, and after 3000' the rate slowed to 500fpm and then 300 fpm.
To my mind this indicates that the pilot was initially descending at a 'normal' rate towards 2500', with power in the 'good' engine reduced for the descent, and under a mistaken belief that power would be available to hold 2500' or descend as required slowly to 1000' prior to final once the airfield was in sight.
A perfectly normal and understandable response to an engine out in a relatively high performance twin. The aircraft failed to respond when asked for the expected power from the 'good' engine, and to my mind that must be considered to be the primary cause of this unfortunate accident.