I'll add to this. Popovic played a 4-3-3 at Victory. He plays a 5-2-3 for the NT. I think Popovic does favour players he has coached before which is a trust thing. But I don't think that those players are automatically familiar with his NT game plan, which is different to his club game plan, at least in the Victory example. That means that Teague shouldn't be any more equipped for the game plan than for example Triantis.
I don't think it's gospel that his game plan is complicated but
@grazorblade did do a good break down of the Indo game focussing on pressing triggers and ball movement when we were pressed. It was really interesting, and did have some complexity to it. Whether that's difficult for a pro to pick up is an interesting debate. I actually think it should be okay, but it does explain some selection mysteries.