Scarecrow is intelligent. His quest for knowledge is also seen in the way he asks for the Oz to give him a brain. He had many options that he could choose from. However, the fact that he chose to ask for a brain is an indication of a high level of resolve that he has regarding having the ability to be there for his friends. He also has native intelligence that enables him to determine some of the challenges that he is likely to experience and as well, develop the necessary steps to handle them effectively.
As he travels together with his peers, they regard him as a highly instrumental individual in their excursion. He bears the takes note of the various problems they encounter along the way and, thereby, create the necessary measures to deal with them. He is also respectful to them. As a result, he has the identifies some of the views they have about the different problems they experience and, thereby, brainstorms with them on some of the measures they could take to handle them as would be deemed desirable. His peers, therefore, regard him as a real gem that they may need to be grateful for.