Innate ability and enrichment are an interaction, in the technical, math/stats sense of the word. If you look at this graph , imagine the top line is high innate ability and the bottom line is low innate ability, and the x-axis is amount of enrichment. The y-axis is performance on whatever measure.

Innate ability benefits kids in all environments; and enriched environment benefits kids of all abilities; but kids with high ability benefit more from enrichment (the slope of the line is steeper).