I think Dylansmom has said before that the blackshoulder males can take 4 or more years to fully color out. I know sometimes it can be a slow process for them. The way the white looks it doesn't look like pied. it is too speckled like what feathers turning color will look like. if some of the flight feathers are a solid white then it could be a split but when you see white up high on the wing like that it looks a lot like photos I have seen of blackshoulders whose wings haven't fully colored in yet. I am on my phone so I can't show a picture of what I am talking about, but image searching young blackshoulder males might bring up an older male that still has some white on his wings.