I was just about to post about this but you beat me to it (see below). This is a universal conversation (screenshots below taken from Dom path) with only references to Kane's rank being altered.
I see there are 3 major puzzles that remain aloof in Ep. 8, or because of Ep. 8.
1)
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Why is Kane's ignorance of his heritage and his full place in the Gambit so necessary for his success in it? If Alexander's main lesson to his daughters was to always aggressively seize power, shouldn't informing Kane, who has lived a life that has taught him "only the rich can have power", that power is attainable if he is willing to take it be in Alexander's best interests? If Alexander is effectively hedging all of his bets on Kane being his continued image/legacy for a generation, shouldn't he be pushing SubKane to "snap out of it, and act like a man"?
2) Here and all of Cynthia's earlier conversations highly suggest that the DeKocks will win something in the Gambit, totally separate from whatever Kane's final fate will be. But what, and how? It's clearly not an assets acquisition should the Gambit fail again, and KG dissolve, else they would not be wanting Kane to rise above K4. It also cannot be a hostile takeover with Kane at the helm, else there is no "ticket" with a SubKane, and Delilah would be trying to get Kane promoted, and fast. Sure a SubKane could take Delilah up on her offer to cross over to DS and save himself from a life of misery, but that is effectively quitting the Gambit, leaving both Kane and DS without reward from the endeavor.
3) Seth. A) Why does Veronica feel the need to torture Seth, B) What is her cover story to the Board on why Seth is there, and therefore what Alexander had planned for him? I had previously thought that Alexander did want him for Astrid, but Ep. 8 reveals that Alexander figured she was dead, has no idea where she is, and would definitely be blocking any efforts to try to save her, so Alexander didn't want Seth, Veronica did. His presence is entirely her project, therefore torturing Seth was pointless and only served her own sadistic pleasure (as demonstrated by Astrid's opposite treatment of him).
So, if Veronica is the one truly running the Gambit, to the point where she is able to add aspects to it that are explicitly against Alexander's wishes (in Ep. 5, she claimed that all 3 siblings being brought to JF was necessary for the next Gambit Phase to begin, so she's lying about Seth), and she is actively rigging the game to ensure that only Olivia can win (whom she might be grooming as a puppet), then can we truly believe her that Kane needs to be kept in the dark, or is that just her sadism again (physical for Seth, psychological for Kane)? She seems to be the only one saying this, and Elena enforces it [but just barely] because she listens to Veronica. We have seen a template with Katsumi, who confessed that while physical sadism was fun, that she preferred the mind games of giving her victims (Seth) a ray of hope, having them cling to it, until the right moment when she crushes them, citing that the despair they exhibit is the greatest exhilaration she can experience.