What about the portrayal of Mr. Krah as a Grima Wormtongue?
Even if Dr. Krah were merely a puppet of Bishop Fellay's designs, I think it will be much easier to attack Krah instead of attacking His Lordship, since Krah has no aura of ecclesiastical authenticity surrounding him which we need fear damaging.
More important still, if Krah were dismissed, would the policy of the SSPX change?
You would think there would have to be a more discrete representative in the world with the requisite piety and respect for the authority of anointed hands and heads.