Bud's brief stay at the Amos residence has had a profound effect on his character, and a positive one at that. Prior to his arrival at this grim, abusive home environment, Bud had always adopted a strategy of passivity, of just keeping his head down and being grateful to his alleged elders and betters, come what may.
But his whole attitude changes dramatically after his appalling experience at the Amoses'. The Amoses' son Todd is a thoroughly unpleasant young man, a bully who repeatedly subjects Bud to beatings.
The apple hasn't fallen very far from the tree, as it were, as Todd's parents are every bit as abusive. Mrs. Amos perversely accuses Bud of attacking her son, when of course, it's the other way round. And Mr. Amos appears to take his inspiration from any one of dozens of adult authority figures in the novels of Charles Dickens by locking poor Bud away in his shed.
It's now abundantly clear to Bud that his strategy hasn't worked; he needs to try a new tack. And he does. From now on, Bud will stand up for himself; he'll be more independent and self-assertive. Instead of letting other people tell him how to live his own life, he needs to take his destiny firmly into his own hands.
Although Bud's experience of life at the Amos residence was deeply unpleasant, it has at least forced him to become a different person. The once passive Bud will now head out into the world and chart his own course in life.
With the confidence this will bring him, in due course, he'll have the guts to take a trip to Michigan to see the famous bandleader Herman E. Caldwell, the man he believes to be his father. In making this journey, Bud will also be taking a big step on the road to manhood.