I want to know the answer to the following question:
Who wrote the Sarva-darśana-samgraha?
All the background I'm provided with is that "When Madhavacharya compiled Sarva-darśana-samgraha (a digest of all philosophies) in the 14th century, he had no Cārvāka/Lokāyata text to quote from, or even refer to.". Is that enough to answer the question?
Answer: yes