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If we force our way into her data logs then this won't matter, but if she actually cooperates with us, then I am reminded of what Karn said during the tournament. Doubly so in regards to Delta's understanding of the pilots.
If we don't sever all ties, then we need to a have a long hard debate with her about the importance of playing nice with the humans. Beta would need to keep it a secret that he has started to genuinely care about Sophie and Thea, so instead we'd have to keep it in terms that Delta can comprehend.
An easy way to start is by pointing out how they can accomplish things that we as a core are unable to.
Thea managed to corner Brighton and get some answers out of her.
Our giant mech bodies nor any drone could have done that. From there, building their trust can yield astonishing results.
Thea kept Delta's secret, and didn't tell command that she was able to operate herself without a pilot. This is what managed to save the day when Beta powered down.
Thea then went to bat for us in negotiating with Kinston for the surgical removal of Echo.
Lastly, our pilots have grown familiar with how we operate and fight. It would take weeks or even months for a replacement to get accustomed to us. This means that any damage done to our two pilots puts Beta at direct risk when he's out on the battlefield putting his life in danger. It would be like if Delta was damaging the guns on the frame or the Yi Accelerators.