He hasn't thrown his split this frequently since 2010, in fact currently it's almost exactly the same % as that season. I'm not sure the velocity is all that different than before, back then it was a very effective change for him. One wonders how much his elbow troubles may have come from it and now that he is healthy we're seeing him use it like he used to. I wonder if the lack of rotation on it is a byproduct of his elbow problems, causing him to adopt a different grip and release.