no possibilities are required, because it doesnt matter whether the prisoners trust him or not. all along since the start, most of the villagers the straw hats have saved did not really trust pirates but they still went ahead and did their stuff.
That's exactly what I was talking about, it doesn't matter. It's an element of the story that could have been played around with more, there have been plenty of chances to do so over the years. But I understand why that's the case, it's not the story being told here. What I said concerning this chapter is just another illustration of this, that's all.