Eric Berger has a slightly different take
on the cause of the leak:
And he reiterates that point later in the article.
On the question of contingency plans to evacuate the station in case of an emergency and how the damaged Soyuz effects those plans:
I wonder what re-entry would be like for someone without a seat in Crew Dragon. NASA states
that during re-entry astronauts experience about 1.4G, so I guess that if they could rig up some padding inside the capsule they would be okay without a seat. A proper seat is critical during launch when forces can exceed 3G.