I stand somewhat corrected, yeah I know what you mean about CPH, they do offer a lot of connections, especially if you intend to go to Scandinavia/Northern Europe, but for Asia or America or even Europe, due to the necessary night stop (I don't actually know what time CPH's long haul departures leave) and higher cost, they aren't a big player. I'd say confidently that 90-95% of passengers on NCL-CPH are O&D.
I can say that you are way off with your O&D numbers for the CPH route - for 2014 the transfer rate at the CPH end was 52% (48% O&D). However the arrival flight at CPH has a lower transfer rate compared to the departure flight due to the late arrival into CPH at 22.00. The late arrival however still makes it possible to transfer to destinations like ARN, OSL, BLL, AAL, PLQ, POZ, GDN.