You cherrypicked that last sentence, and reiterated what the N-1 sentence said.
I think the point is that this study suggests a causal relationship (having leadership power enables one to make more money), which is stronger than just correlation (being in leadership positions correlated with making more money).
But added "annually"! That's a lot better!
I think the point is that this study suggests a causal relationship (having leadership power enables one to make more money), which is stronger than just correlation (being in leadership positions correlated with making more money).