I dont think there is much benefit on a TGS style bike.
From my knowledge of floating discs they started in the motorcycle world (i beleive) with the idea of the floating part helping stop the disc from warping when they get hot, you would often find that a floating disc would not actually be floating after intense use as the heat has made them expand, such heat without the floating part would make the disc warp and possibly stay warped.
With no real speed used in trials im not sure of any significant gains of floating, just another part that has potential to go wrong if you ask me
Im sure there could be some other benefits aswell, they also look very smart..... :wink2: