The part where you calculated that a mixer exists in the 990 when none does. This is like earlier when you calculated that off-centre dialogue would move towards the centre when using a centre speaker (but actual listening demonstrated otherwise).

Of course, you are free to believe things like a mixer exists in the 990 or that "imaging is shot" when using a centre speaker. But given a choice between your "mathematical analysis" and reality, I'll opt for the latter (which doesn't support any of your above claims). Really? Which A/V companies are allowing software hacking of features such as surround processing and/or speaker configuration? Hackers aren't their market.