"'Wait a minute!' called the Scarecrow. He had been thinking what was best to be done, and now he asked the Woodman to chop away the end of the tree that rested on their side of the ditch."
~page 81 of L. Frank Baum's The Wonderful Wizard of Oz
Baum gave clues to the fact that the Scarecrow, Tin Woodman, and Cowardly Lion didn't really need the Wizard to give them a brain, heart, and courage, respectively, all throughout this book. I always found it ironic how the Scarecrow and Woodman in particular would keep going on about how they didn't have a brain or heart when several instances showed that they did have them figuratively speaking at least even if they didn't have the physical entities. There were so many occasions in which the Scarecrow was the one to come up with an idea for how to get them out of a tight spot. Baum even wrote that he had been thinking. In terms of the Woodman . . . he cried because a creature had been killed at one point in the book. I think that pretty much says it all. Even the Cowardly Lion had performed brave acts even though he was scared--like standing up to the Wicked Witch of the West. It just goes to show that they didn't really need the Wizard to grant their wishes, for they already had what they wanted.