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The pins under the removable cover are for syncing the camera by connecting it to other devices, yes. Intel is still working on developing the software support for this feature. You can read about it in this Intel white paper on connecting multiple cameras:
Page 46 of the data sheet document also describes this interface and its pin-out details.
Regarding multiple USB 3.1 devices, the earlier discussion on the subject linked to below may be useful to you.