On the contrary, I would suggest that the tacit assumption would be that any SSPX priest wants to follow the traditional SSPX position laid down by Abp. Lefebvre, and written in the official SSPX statutes.
If some other position is to be held, it needs to be officially promulgated.
The Accordistas seem to understand this -- they frequently inject into their sermons, classes, articles, and interviews more "pro-Rome", "pro-Pope", "pro-Vatican II" elements, because they know that most of the Faithful don't necessarily share their opinions...yet.