Because you don’t think he can return fully healed this season, or because you don’t think he’ll be useful even if healthy?
Quality depth is not a “nothing burger” IMO. We’ve burned through most of our immediate positional depth due to injuries and trades (unless you think Pache and/or Waters is feasible in 2019). Regardless of what you think about Riley’s struggles, there’s no denying he’s a damn sight better insurance policy than Rafael Ortega or Lemarre.
Now let’s hope for some good news on Dansby.