Collecting questions for SnP market maker

Hi all, I have a friend who use to be a market maker for SnP. He handled products including ES and SPX. He likes the idea to do an AMA but unsure on the timing. As a result, I want to collect the questions here that you have, forward it to him then start either a new 'official' AMA thread or just reply back here. Can't guarantee he will answer all the questions but he is pretty open to what he can answer.