Did you see anyewhere confirmation that CHN judge was removed from panel because of bias? Maybe I missed it but I thought he just wasn't assigned to free dance from the begining because there were too many judges entered by feds to this event so some of them were assigned only to one segment.
"In case that at the time of the Judges draw more Judges will be available and entered as required to compose the panels of nine (9) Judges in one or more disciplines, the ISU Event Management Team will conduct the draw for nine (9) Judges for the first segment. The Judges, not drawn for the first segment will be seated for the second segment." - I thougth it was the case here; it's from a announcement document at ISU event page.
That's why he (CHN judge) needed to work hard in RD. But I believe, as for deals between judges, they are more complex and go way beyond one segment and even cross-disciplines. One will do a little favour here and other will pay back in different segment or even discipline.
Anyway, it's my last annoying input on this matter, I'm moving forward