What label you put (e.g., swingman, wing) is not as relevant as the performance and skills of a player. That would be the same as saying that you did not need a PG in previous years because you had Tate and Starks who were older and more experienced.
Same idea as Hill, DJW, and AJ? There is a huge difference in performance/level between Hill and DJW/AJ, Actually the competition at 3 is not that great, given that DJW and AJ have not established themselves yet. We really do not have a reliable option at 3, other than Hill, and Kipper has a golden opportunity to beat DJW and AJ in the rotation, if he is good enough. It is not that he is a sure thing, I have never seen him (neither have you I believe), but the bar is not that high.
AJ has not taken advantage of opportunities yet, even as a starter earlier in the season, while DJW has shown flashes of potential but has never shown the consistency in his career (even at HS). Furthermore, DJW seems to not be getting the opportunities for whatever reason.