There's no video from the IFU-30 /briefcase, because there isn't any video connections to it from the RAU.30 interface .They're not not connected at all internally .There's only 50 points which are connected from the super grafx's exp port going to the RAU.30's connection port,so that's 19 missing and out of those 69 ,the video out put from the super grafx are included .
Just look at how thick the cable is ,think how bigger it would be with all 69 connections.