Unless we're looking at different "charts", Verizon's numbers do not detail Cogent specifically. Regardless, I'd be willing to bet a very large sum of cash that Cogent sends Verizon far more data than Verizon sends Cogent.
And I would bet no. Lest we forget that Verizon runs the former UUnet, AS701, which still has tons of business customers, hosting providers, etc on it.
UUnet has always been a major "exporter" of traffic, because they have always had the big name customers on their service.