Well, it was definitely the input shaft seal leaking. Gbox was equally puzzled by this but helpful and responsive over the phone.
They requested that I confirm it was for sure not crankcase oil and that my pilot bearing was not seized or missing.
I pulled the clutch and flywheel - both nearly brand new and in good working order. The RMS and IMS were both dry. I did install a new pilot bearing just to eliminate that as a possibility.
I pulled the main shaft seal of the transmission to find that it was definitely leaking. Interestingly, it was not an OEM part. Comparing the 2 seals side by side, the OEM Porsche part was clearly more robust and had more surface sealing area. I would have expected that a high end company like GBox would have used OEM seals, and perhaps seal failure is really the root cause here.
Then again, only time will tell...
Here's a picture of the 2 seals side by side (The non-OEM seal is damaged due to removal)
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