Your reasoning FTL. What does Macross Plus and Macross 7 have to do with the Deculture cut and the broadcast cut? And yes, you should concede, as the broadcast's strong showing could indicate that the Deculture cut left a good taste in viewers and reviews mouths, causing even more to tune in for episode 1.
You can't ""un-watch" a show after having watched it. People can't say, oh hey, I didn't like Deculture cut, so count me as not having watched it. Hell, every single person who watched the broadcast cut may have hated it, we won't really know until we see the numbers on episode 2.