Like the shadow “illuminates” the light?
But it does require one pay attention to what is being said through John and the rest of the Scriptures. Concluding that anyone was being asked to eat human flesh or drink blood was the error made by those ho left off following Christ due to taking his words in a narrow, literalistic sense.
. . . rather than in the sacramental sense. You can't get a metaphor out of "This is My body."