As for Quicksilver, I think this ep puts a damper on the idea that he's actually Foxsilver bringing the X-men into the MCU. Seems more like it's just a meta-reference and he's the same Pietro body as ATJ. but as speculated his consciousness may well be someone not on Wanda's agenda at all. He makes note of Vision being dead already causing Wanda to push him away, did I miss one of the kids telling him that? Not sure how he would know otherwise, seems like a red flag.
I think it's too early to write it off. In the same way Monica took on a new persona, Foxsilver could have been altered as well. Like it's physically Foxsilver, but Wanda has implanted him with all her memories of MCUsilver.