The "wimps and klutzes" are the real people rather than the heroes that are common in many stories, unrealistic and not relatable. The little pebbles are interesting to include; what could be meant by the tiny grains? Small actions or maybe personality traits?

Novels are metaphorical containers. They carry emotions, conflict, relationships, etc and serve as a very powerful tool to demonstrate a journey.

Interesting choice of word to describe the container. A "recipient" could have double meaning in the context of the essay.