Higgers is currently 3rd 8 but I can see that changing next year, McCalman is a workhorse but no more than that, and Palu is made of glass. Higgers is the closest player we have to a Read style 8. He has good read of play and is good at creating attack. In 2013 form he'd have been a close pick to Palu but of course his form dropped.
If I had to guess I'd say he was a bit stifled in 14 by the conservative game McGahan fostered, as has Pyle I believe. I completely agree with others here that McGahan's conservative approach is too conservative. I can only hope he revisits the mix for the coming season.
I think the game plan that TT plays has a lot to do with it too. Last year he was more free-flowing (like Pyle) and that allowed him to make his more natural loose game. This year TT has kept things much tighter and Higgers has had to change his style. Naturally that will take adjustment and that may result in a form drop.
Perhaps when they have their season retrospective they might bring things up like this. That have simple benchmark to work from; play like you did against the cheetahs and you will go places.