Yes, there are more aspects than just the ankle which can limit ankle dorsi flexion.
System of systems.
What did the PT say about addressing your feet?
Any recommendations?

Have you voodoo wrapped your ankle, wrapped your foot?
Used a gemini or lacrosse ball on your foot?
Episode 77: Plantar Fasciitis dysfunction in the plantar fascia can impact dorsi flexion
Episode 337: Long Ruck Feet Or Ultra Marathon Feet?
Pro Episode # 59 – Reclaiming those Gnarly Feet
Easy fixes for the ankle and foot
What is your shin like?
Monday March 27, 2017 Voodoo Bone Saw
What is your Gastroc/Soleus like?

Had a recent shoulder injury?