Hi
If you by RGB mean Component, then you can not distribute this in the link rooms (even though it is NOT digital!), here is from BV7 with BS3
"HDMI, VGA and Y – Pb – Pr signals cannot
be distributed from a main room television to the link room system."
I have a Tvix M6600 connected to my BV7 with HDMI and SCART, and as you also say, the picuture is very dark in the link rooms when using SCART. Therefore I think I will buy 2 more Tvix (N1 version though) for each Link TV (BV8).
There is something about B&O.....