Naaman takes the letter and the gifts directly to the king of Israel. The king is nonplussed. And distrustful and fearful.
Why does the king of Israel react in this way?
Elisha, on the other hand, hears, understands, and acts.
Kings need a prophet.
Naaman, as powerful and successful as he had been, needed help. He was willing to listen to a captive girl, a servant. But, he and his king, thought that the person she had recommended, if he was as good as she said, must be working for the king of his country.
Who wouldn't think that? Where do we turn for help?