re: Agatha, I agree, I don't think Agatha is the one who sent the letter or set up the situation for Wanda. If we take Agatha at her word, she was drawn to Wanda after Wanda "used magic" to takeover the town.
The SWORD director obviously cannot be trusted but is his ambition limited to rebooting Vision and did he manipulate Wanda to accomplish that task?
According to the West Coast Avengers story line, the silver colored Vision is a bit more cold and robotic than the Vision Wanda knows and loves. Also, there was some reprogramming that went on to boot. Last episode this Fri... can't wait.
On a side note; between WandaVision and the Mandalorian, these are the only TV shows our kids want to watch with us. It's turned into a family night every time we watch. And for anyone with high school age kids, you know how hard that is to accomplish.