There is something I don't understand about Callista and it has been bothering me for a long time.
First of all, she could have taken her family to a safe place with the help of deCOCKS. (if only Alexander's men were to be feared)
If Alexander had threatened Kane with a programmed disease or poisoning or chip she could have asked help from the deCOCKS then put Kane into stasis. (like Astrid)
Finally she could have blackmailed Alexander then Veronica with Olivia's life. (and in this way she could have obtained help for Seth or stasis)
In the light of the above, I think it is clear that that the gambit is far more important for Callista than the life of Kane.
The problem with all such reasoning is that it doesn't address the reality of the game in any way... All these events with little Kane and Olivia happened 20 years before the game started (i.e. before Kane's first day in prison). And while theorizing about some current events makes sense if only because by analyzing the facts available to us we can arrive at the truth, abstract speculation about what happened decades ago is worthless. At least until we have new facts about these events from which we can draw some conclusions.
The only evidence we can take into account right now is Callista's words in the scene with Elena on the bridge, where she said that she simply had no other choice and not fulfilling Alexander's terms directly threatened the lives of Kane (and Olivia).
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So take that as a given, as an axiom, because that's what Tess decided to do, making it a given in her game. Well, at least we should wait for the son and the mother to meet so we have more information. For now, Tess is hiding this information and only Elena knows the full version of events about why Callista did what she did (their dialog in one of the caves where they went after the conversation on the bridge, which of course we were not shown).
And I don't even see the point in discussing the fact that the only cryostasis center we know of belongs not to the DeKocks, but to the Karlssons, and the fact that the principles of cryostasis/anabiosis we know (described in science fiction) allow us to immerse a person in this state, allowing them not to age...So in Kane's case (even if we imagine that the DeKocks had access to such technology) it turns out that in 20 years we will have not a 20+ year old guy, but a one year old child/infant whose normal development was frozen thanks to cryostasis.
But in any case, this is all nonsense and empty reasoning that has nothing to do with game reality. And the facts (at this point in time) are that Callista simply had no other choice. And we can't judge what was most important to her until we know her whole plan and
at least talk to her (on Kane's behalf).