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![](https://startrek.website/pictrs/image/3b51f06d-2714-4fac-8a90-79f5f1397c7d.png)
I would like to know why the Gorn was there too, but the Gorn didn’t notice Spock boarding and so there’s no reason to believe Enterprise would have notice a Gorn boarding. It’s also possible it was beamed over when the Cayuga was destroyed to find something or to access the ships systems.
Cayuga is a connie according to memory alpha - confirmed in some background graphics: https://twitter.com/timothypeel1/status/1690018124492349440/photo/1