Regarding 6 million. That's not how many were burned in the…
Regarding 6 million. That's not how many were burned in the facilities. Around 3 million is more accurate. The rest of the 3 million were killed outside of the camps. 6 million is the total killed, not total cremated.
If you're interested in the numbers debate, a good thought experiment is the Hungarian deportation of Jews I mentioned where about 400k Jews were killed in the span of 2 - 3 months in Auschwitz.
If we can make that math work, 3 million over the course of the whole war isn't hard to imagine.