Thread:Nerdtastic1221/@comment-2106279-20190426144146/@comment-2106279-20190429104322

Returning the stones from whence they were taken repairs the split in time. So once Cap returned the Aether at the end, that timeline didn't happen, where Frigga spoke with Thor.

That was the whole point of the discussion between Banner & the Ancient One. She was saying if she gave up the Time Stone, the split timeline would have no defence; Banner's suggestion was returning it would prevent that timeline's existence.

Every single Infinity Stone involved in the Time Heist was returned, therefore eliminating that part of the timeline, with the exception of the Tesseract in 2012.