@sean Good questions. The way I see a RAG being constructed / or other knowledge graph would be to associate Contributors with Questions and Answers - so you need the Question Answer relationship to generate plausible answers, but the Contributor Answer relationship lets you rank Answers higher from higher rated contributors:
See something like this:
He, Xiaoxin, Yijun Tian, Yifei Sun, Nitesh V. Chawla, Thomas Laurent, Yann LeCun, Xavier Bresson, and Bryan Hooi. "G-Retriever: Retrieval-Augmented Generation for Textual Graph Understanding and Question Answering." arXiv preprint arXiv:2402.07630 (2024).