Okay, I could of course be completely wrong here, it happens all the time but I notice Alan seems to be preoccupied with the logo/branding. Having removed the kangaroo from the uniforms, see below, I wonder if the evolution of the kangaroo on the tail is designed to progress to a white swirl on a red tail, eventually becoming a hint or nod towards being an image of a kangaroo. An abstract image if you like.
In an attempt to "internationalise" the brand and remove the cultural reference to make it more palatable to someone?