Final answer:
If Richard Parker dies, Pi would mainly be left with his thoughts and memories, as well as being physically alone in the vast ocean on an empty lifeboat, facing both psychological and existential despair.
Step-by-step explanation:
Pi will be left alone primarily with his thoughts and memories, which can be a reflection of the despair and isolation that one might feel in such circumstances. However, from the broader perspective of the narrative, Pi would also be alone in the vast ocean, literally left by himself to survive in an empty lifeboat. These themes are common in literature where characters face profound isolation, especially in sea voyage narratives. The excerpts provided all deal with themes of crisis, decision-making, and the weight of solitude, reflecting on the profound emotional and psychological challenges that characters face in desperate situations. This resonates with Pi's experience, as his companion, Richard Parker, has been central to his story of survival and to the emotional journey within the narrative.