But if you can't change your past there was still a Thanos in 2012 and Loki was still imprisoned on Asgard so does that mean the 'new' past is an alternate timeline? Yup. Headache lol.

Also you've just reminded me of Ronan's face at the end of Captain Marvel when Carol shows up lol. And the guy eventually gets defeated in Gaurdians by a dance off. Guy keeps getting hilariously beaten.