1. Keeping it in one thread would be advantageous at this point, whether it's like 'montage, some time later!' or whatever we do. Good okay. We could even start that on a new line whenever we know how it happens. I actually interpreted that by the end of their search, Jess and Tony kind of have a truce on the whole matter and it might have got a little weird for a second there but let's move on. So then Tony could reasonably be like 'Why don't you go stay at my place, I'm not using it and there's not a bunch of total weirdos taking up all of the showers. I mean seriously go shower.' (Unless Jess hasn't been living at the defacto Avengers HQ then I guess that doesn't work). Anyway, if that makes sense then the thought was, she goes there with peace in her heart so that Tony can then collect Bruce and whatever they need for brainsurgery and blindside her together, already near a lab. Does this..follow...idk.
2. I saw Sphere when I was like 12 so I don't really remember a lot of it outside of like atmosphere and vague non-plot, so if that's all you got too then we're on the same page. Basically, I was hoping they'd end up living in this alien technology and coping with it until they can find a way back to the surface.
3. I think they can do this with the people they turn, and like really strong ones can do it to whoever within a certain radius? I don't really remember. But Really Strong Ones can do whatever we want basically I think, AND the initial mystery that Coulson and Jasper had gone up there to investigate in the first place has yet to be resolved. So there's two things. I laid seeds for a sort of really old, really insular coven using their really old magic to open a gate to hell and feeding off the surrounding towns to support it. If...if that's a thing you want to do.
4. YAY. I didn't want to do anything super cereal out there, but like doofing around and getting into street-level shenanigans sounds about right. Would Kate be like 'sure I'll go along for the ride', or would she have her 'I don't need no man' crisis and head out there on her own to spread her wings and instantly get into a pile of trouble?