Aharonov had the basic idea back then. I suppose he was influenced by Wheeler-Feynman. I.J. Good in "The Scientist Speculates" may have gotten the idea from Yakir? In any case, from Feynman's path integral POV it's not really a stroke of genius to realize that the future post-selection and the past pre-selection must influence present measurements. Of course, Yakir's development of that insight in the details is impressive work of the highest order. However, only recently with the insight that we have both past and future horizons does the cosmology begin to make sense and come into focus.