From watching on telly, it looked like Tanner was part of a front 2 and Cadden was mostly sticking to the right.
In a game like that, though, with so much possession and Queens Park bedding in, there was more scope (and a need) for players to switch up their positions to try and create.
I think we'll get more of an idea in the next game, but even then, formation will still be in part dictated by who Robinson decides is the fittest.