Why? Who would you cut? Whose minutes would you take away?
If there's a serious, long-term injury to one of the 5 bigs on the roster, it makes sense to waive Dupree and bring him back, which is exactly what they're planning on doing. As it is, Amir Johnson has only received garbage minutes against Orlando, no rotation minutes yet. Bringing in another big and putting him in front of Johnson just makes the situation worse.