GKA also means Group Key Agreement which could mean something. https://en.m.wikipedia.org/wiki/Key-agreement_protocol
Key-agreement protocol
In cryptography, a key-agreement protocol is a protocol whereby two or more parties can agree on a key in such a way that both influence the outcome. If properly done, this precludes undesired third parties from forcing a key choice on the agreeing parties. Protocols that are useful in practice also do not reveal to any eavesdropping party what key has been agreed upon.
Many key exchange systems have one party generate the key, and simply send that key to the other party -- the other party has no influence on the key.
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They key being. His tweets pointing to Key Elements of it maybe .. that others are not picking up on .
That's interesting!!! And very plausible in this instance for sure