FWIU, the last hearing for Terri's guardianship was a long time ago, before Michael and Jodi moved in together. As such, it could not have been brought up as a subject then. However, there was something decidedly improper about Judge Greer firing a guardian ad litem who sought to point out that impropriety.
My personal thinking is that Greer realizes that he has to tread very carefully or risk impeachment; the timing of the motion to remove Michael as guardian could turn out to be good, if Greer doesn't allow endless continuances.