Is Willum, the doctor, scared of El Patron? One piece of evidence.

Willum does a great job of pretending to be surprised. It's almost as if he set Rosa up to take the fall. He is calm and cool when talking to El Patron.... confirming rumors and diagnosing what he knew to be true.

Instantly—he must have been waiting outside the door—Willum entered and began examining Matt. He shook his head as though he were genuinely surprised by the boy’s condition. “He’s suffering from mild malnutrition,” the doctor said. “He has sores in his
mouth. His skin condition, I would say, comes from a combination of dirt and an allergic reaction to chicken litter.”