What I believe is irrelevant as my statement still stands and is true whether I believe it to be the primary or not. Whether I believe it to be primary, secondary, or otherwise does not change the truth my statement conveys as it was stated. You read your own interpretations into it. As nothing to either way is conveyed in the statement itself.
Having said that, since you asked (and this is the first time you have rather than just assume my position), I believe that it was the primary reason behind it (note I said primary and not only reason as other reasons existed as well), but I do know several that believe otherwise.
What do you believe those other reasons were?