Kaweka puzzle

Just finished a long planned crossing of the Kaimanawa and Kaweka ranges and one section of track between Tussock and Harkness huts had us 'scratching our nuts'. The track leaves Tussock hut and heads across the grasses (an obvious footpad marked with waratahs). After about 3km the marked track heads straight down to the river (TR) and another waratah on the opposite bank (TL) marks the crossing point. There is a short footpad continuing on the TL, then nothing. There is a rocky bluff on the TR, impassable scrub/trees on our side and a very deep pool which would require a 20m swim. Where does the track go?? The only options, we thought, was to climb back up and look for a track - TR or TL ?? - No evidence of a footpad on either side so we went for the TL (why drop from the TR only to go straight back up?). So, we climbed up on the TL, pushed across the scrub and descended a narrow gully to the river and crossed to the TR and regained the track. While up high, we could see a vague line (old track?) that continued high on the TR from where the track dropped sharply to the river. Is this the correct route? If so, why are there half a dozen waratahs descending to the river? and another waratah marking the crossing to the TL ? Can anyone throw some light on this?