the boys fight to show who is better against the city boys. and yes, pony boy is diffrent cause he doesnt imagine himself as a violent greaser. he pictures himself as a person with an actual future. plus he always sticks with johnny, and after what happened to johnny, johnny is afraid to even face the city boys, so pony boy sticks with is freind. and sorry if this isnt exactly acurate, i read the book a few months ago