Not a blessed thing, unfortunately for him. While they've been very inconsistent before and since, the tenet here was that Ben didn't jump into HIS past, but another reality...or managed to create his own parallel universe because of his interaction with the timeline. Effectively, he was incapable of changing his past, because by doing it he'd create a new reality, thus no paradox (i.e. If Ben was never the thing past that point, Reed would never have invented the cure nor would Ben have ever wanted or needed to travel into the past, hence paradox).