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I would posit that his low stats are due to a rather fucking terrible shortage of pill for anyone wearing a jersey number > 12. I would agree with you though about that isolated instance where he should have thrown it to Harris, indeed I was yelling manically at my TV for him to do so.
BUT, I wholeheartedly disagree with you about him performing poorly at super rugby and Test level consistently. In fact I think that he has been by and large one of the better performing backs in a season of poor performances by backs (and consistently good for 3-4 years now). He seems to be our best at picking holes/angles to run and he is an excellent defender (particularly from 13), can kick the seed a fair way and is goodish under the high ball.
See the following
In short, he is indispensably solid but with enough X-factor to make him a consistent team selection.
He should be starting, and now that diggers is healthy, he should be starting at 13 with Mccabe and taps competing for the 12 spot (though I personally think in a backline without cooper, having the noted excellent short passing of tapuai right next to the 10 makes more sense, McCabes best spot is 13).