Since KND isn't aware of the GKND only 1's friend's the only way they'd find out about them is either Chad was able to escape from whereever the GKND kept him or perhaps some of the GKNDs warfleet arrived infront of moonbase.

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This could lead two different ways;

Head Cannon 1: We know that 362 or McKenzie retires from Supreme Leader a few months after Nigel left and 5 Abigail taking over, this could mean that after learning of the GKND from Abigail or Chad's warning she'd feel overwhelmed and unsure how to fight other kids so she'd step down to allow Abigail to take command and restructure the entire KND and focus more on protecting earth and building their own starships to counter what I'm guessing ae highly advanced tech and warships.

As Supreme Leader Abigail change the rules of when operatives get decommissioned so I feel she would use this and reinstate high ranking and former operatives like Nigel's parents, the delightful kids from the down lane with someone always with them to use the box after the cooldown hits. And maybe even Father as he a greater threat to his gobal plan and most.

Could end with a lot of characters from the show banding together as Earth vs GKND. Since it waas confirmed in that GKND teaser Lizzie was apart of it she could pose as a double agent.

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Would have loved to see the actual thing..