If we follow the Rancho ROADMAP for this one, we will see that a PF stop is not indicated (though he may benefit from a DF stop). The patient doesn’t have any spasticity causing excess PF during swing phase or a lack of proprioception to not know where his foot is in space, so the DF assist along with his 2/5 ankle dorsiflexors should be sufficient to clear his foot. He isn’t demonstrating any knee hyperextension during stance phase that might warrant a PF stop.
A DF stop may be warranted based on the ROADMAP, though I think this would be more indicated for patients presenting with knee buckling or hyperextension during stance. I would elect to provide the simplest brace possible to meet the patient’s needs.