I agree you usually play zone. But I don't have a problem with mixing it up from time to time to keep the QB guessing. And in this case, I think the play call probably works if Lattimore and Harris don't run into each other. Harris likely holds Goddard to a short game or Howden comes up to make the tackle. The execution was a clown show.
And it wasn't a rub route. The DBs just inexplicably ran into each other.