Final answer:
If Plavacheck had helped without returning in the story, the protagonist might have faced new challenges, altering the pacing, resolution, and moral of the story.
Step-by-step explanation:
If Plavacheck did not return but instead helped without returning in The Three Golden Hairs of Grandfather Know All, the story would have likely seen some significant alterations. First and foremost, the protagonist, typically facing numerous trials and tribulations throughout such tales, may have encountered additional challenges in achieving his goals. This could potentially lead to a different development of the character and new subplots. Secondly, the timely resolution that often accompanies a protagonist's return might have been delayed or altered, creating a different pace for the story's climax and conclusion. Lastly, the story's moral would likely shift from the importance of perseverance and the cyclical nature of one's journey to perhaps a lesson about the impact of indirect support or the value of delegated problem-solving.
As this question involves theorizing about changes to a story's plot, rather than confirmed details, considering the implications of hypothetical scenarios maintains the spirit of the original question and encourages critical thinking about how narratives are structured and what lessons they aim to convey.