What brings Ralph into closer sympathy with Piggy?

In Chapter 5, Ralph says that Piggy can think things through, and how he has all his ideas lined up in his head. Hear is an excerpt:

Once more that evening Ralph had to adjust his values. Piggy could think. He could go step by step inside that fat head of his, only Piggy was no chief. But Piggy, for all his ludicrous body, had brains.

This shows that Piggy would be heard more if people could see past his weight.

Hope this helps!