Yes. It's a box and one, or it is supposed to be. One guy sticks with the DT'd player in man defense and the zone shifts around them with the help defenders rotating out depending on the zone's current positioning. Thus the zone is still in effect and shouldn't leave too many open shots. In theory, the best defense to DT from. I tend to believe, tho, that HD treats it more like the press, in that the DT'd player is simply covered by the 2 closest defenders at that time, which does leave more holes in the zone than the above scenario, which makes the triangle and 2 even more difficult as well. But, to fully answer your question, it doesn't leave anyone more open than running man would since the zone is still in place, just diminished by one player (the help man).