Board Thread:The Flash discussions/@comment-9346948-20161123011226/@comment-3423279-20161125003420

Kir the Wizard wrote: It was not before 2000s and his creation of the "Negative Speed Force" that Eobard became much faster than Barry. They never actually established who was truly faster, just that Eobard's speed force was screwing with Barry's.

And then Eobard learned how to make the Speed Force do what he wanted, aging things to dust, aging himself faster or reverting to his child form, and somehow making himself independent of Barry's existence during Flashpoint.