How Helly reacts to finding out what Lumon is doing to Gemma. My initial thought process was to hate Helena more considering she knows damn well what Cold Harbor is and pretending to help Mark find Gemma, seducing his innie into sex, and stalking his outie for unrevealed reasons, seems to me to be the peak of despicable (unless she's secretly trying to undermine Lumon and prevent Mark from completing Cold Harbor, which I doubt at this point).
But how Helly would react to learning the truth is inherently compelling to me. Helly R reacted more adversely to the concept of simply being a severed version of another person who only exists to work on the severed floor than any other character we've seen. She was so against that level of injustice that she attempted to kill her outie by committing suicide. When Helly discovered that Ms. Casey was Mark's real life wife, she was flooded with genuine empathy and a desire to help rescue her. Imagine how she'd react if she discovered that Mark's wife has been severed 20-50 times and each of her numerous innies only exist for torturous human experiences of repeated unpleasant experiences. AND on top of that, she knows her outie is next in line to run the company and has done exactly nothing to stop what's happening to Gemma.
I think this recontextualizes the scope of the Helena/Helly is pregnant theory in a huge way. If it ends up being the case that Helena was trying to get pregnant by sleeping with i!Mark that really only complicates relationships going forward. Whether Lumon interfered with Gemma's fertility or not, the struggle to have kids was corroding Mark and Gemma's relationship and presumably set the conditions necessary for both to end up severed. So on the one hand, it would be a titanic slap in the face to both characters if Mark was seduced/tricked into siring the next in the Lumon CEO line, but with reintegration, i!Mark only just learned the history of his outie's marriage to Gemma and presumably just experienced what it was like loving her which complicates his feelings for Helly and probably gives him guilt for ever having slept with her. o!Mark is the same person at this point but he's going to have to come to grips with the knowledge that his innie fell for and slept with Helena Eagan's innie. Gemma has no idea what his innie was doing or that Mark even has an innie. Helly doesn't know what Lumon is actually doing to Gemma yet. Now imagine every one of these characters learn the truth and a pregnancy is added in the mix.
And I thought of this while typing this up but what if Reghabi knows exactly what Lumon is doing to Gemma. We know she was working with Lumon on implantation of the Severance chip. She knows that it's really Gemma down there and knows she's alive. That does seem to indicate that she also knows what's happening to her. What if the reason she defected from Lumon in the first place is because she learned about what expanding the Severance procedure has led to, e.g. What kind of human testing they're undertaking on Gemma and how morally evil that is? But what if Reghabi originally proposed the idea that the technology could be expanded for multi-tiered Severance. What if her entire motivation is guilt over what's happening to Gemma? That would explain her fixation on trying to motivate Mark to reintegrate and re-enter Lumon as a reintegrated worker. It might explain why she keeps answering questions vaguely, because she'd be afraid to reveal the truth of her complicity in what's happening to Gemma. I'm purely speculating but it would help get Reghabi's character back on track.
Regardless of what the truth actually is, episode 7 was huge for the wider implications of the plot and anyone who said this was a filler episode that didn't move the plot forward (I did see a few on Twitter) is someone who has a second grade level of media literacy.
Edit: reading my own post back to myself, it's interesting that the way the show framed Mark's full reintegration was through his innie essentially downloading his outie's memories of Gemma. Ostensibly, the core difference between the innie and outie was the innie was unburdened by the pain of losing Gemma sourced by the memories of her that o!Mark treasured. Reintegration presumably couldn't be completed until innie Mark could integrate with these constructs of his outie's identity and psychology. I think a lot of people presumed that already but it's interesting to think about.