The early days of Modern Dance were dominated (mostly) by two figures Martha Graham and Doris Humphrey
Martha’s was an iconoclast who was excellent at self-promotion and had a behind the scenes benefactor/mentor who helped tremendously
Doris was the one who had the actual insight for the mechanics of choreography and teaching
Most of the children of modern dance are children of Doris while Martha remains the figurehead
It is often thus
Kirby’s son is fighting an uphill battle while tilting at windmills- he comes off as petulant at best - make the jack Kirby movie and let content decide who was who and what was what
Otherwise *yawn*