I have never seen Joshua Ward Hibbert play, but as a junior, he was more of a doubles specialist. His peak singles point is around 330 (don't think that is even top 50 level). Without his doubles points, he wouldn't be in the top 10. So I really questioned his decision to turn pro instead of playing at Texas A&M. But I wish him the best and hope that everything will work out for him.
I seen a couple of his Video on youtube he has a Big Forehand & Serve but yes he does come off as a doubles specialist, I wish he can get better in Single through, I think his main problem is Consistency.