No.
the scaler is used for more than scaling. Its used to display on-screen menus, pip, etc.
so all paths lead to scaler, then the scaler produces the analog signals need by the lcd array.
in XBR950 series, the DVI feed (if digital) bypasses the analog to digtal stage and is sent to the scaler directly.
in the case of the bravo, its outputing 720p, that must be upconverted to 768p. I don't believe anyone has got a GWIII to sync on 768p.
the bravo has a goood scaler, but a poor deinterlacer that only has flag reading for 3:2 pull down, and no motion artifact detection.
with your set get a faroudja player or a progressive panasonic (the dvd-xp30 while discontinued is a top line player that you can get for a good price).