i also don't buy the 'no need to teach balance' part.
yes people learn balance when they are 1 year old... but they may not consciously pay enough attention to it during tennis, because there is a BIG gap between making a UE and falling on ones face due to loss of balance.
kids I have helped, told me they play better when reminded of staying in balance.
i think murray is a better model for recs to copy as his head is always so quiet...
joker on the other hand, looks like a bobble head doll out there.