Attach ESC to sombrero via XT60 connector

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I have this kind of connector coming off my car’s ESC. I am now understanding that I need to connect the ESC to the sombrero by way of the third XT60 connector. (The other 2 XT60s are soldered to the sombrero.) Is the method for doing this to cut off this existing connector (shown in photo) and solder on the third XT60 connector in its place?

Doesn’t the Sombrero documentation tell you what the connections are and what connects to them?