Does anyone have any solid theories? I'm worried that this mystery will be built up so much that people are going to be disappointed by the eventual reveal. What could Michael have done to make him stop being her shadow, withdraw from her and Amanda? What would make him repeatedly rebuff Michael reaching out to him in the years after the incident? Does it have something to do with his half human side? To be honest, I am having trouble coming up anything sufficiently emotionally devastating to warrant Burnham's obvious guilt and regret. That said, we know he's held an ongoing grudge with his father for 18 years going by 'Journey to Babel'.