Or you've got trampoline legs.
That added height is what makes the 'taller' forwards more effective against the likes of Dale Morris etc.
If you put together that 6cm of height plus maybe another 6 in arm length plus a possible advantage in vertical leap, then factor in the forward being in front of the defender which adds probably 5-6cm for the size of the torso and it makes it REALLY difficult to spoil someone if they're taking the ball as far away from their body as they can