las,
Do we apply those dff regarding Yibum?. I know the Chasam Sofer does mention some differences regarding a Meshumad or one that is just Mechalel Shabbos.
See the above Shu”T Chelek A”H Vol 1 siman 57, and Vol 2 – 83.
On the same note, many mention Shabtai Tzvi YM”S or SR”Y.
So there is definitely a cutoff line.