DD has 2 or 3 team mates with giants who are no where near their kip cast handstands....DD has had a beautiful KCH for 2 years - and JUST got her giants on Friday (new gym, training differences, finally figured out how to tap...).
I figure they are completely different skills - one strength, the other body position and timing. The girls who can giant and not cast over horizontal (REALLY) are long, thin and not very strong...DD is short, and very strong.
Will say it is quite possible to do well at L7 bars without giants, DD always had 10.0 start values, but it is near impossible to do so without KCH - so it has always made more sense to me for that to be the cut off gyms made, not the giants....but what do I know - I'm just glad to see her finally able to do both so she can finish learning her L8 bars now!