Pell replied that "it would only be implausible if there was evidence that they had been told in some way or other".
It was the second day of evidence for the 74-year-old cleric, who because of ill health could not travel to Australia to give evidence in person at the inquiry into decades of child abuse.
Two dozen Australian abuse survivors and their companions travelled across the globe to witness Pell's testimony in a hotel conference room in Rome, a significant show of accountability in the church's long-running abuse saga.
Pell said he suspected Mulkearns concealed the allegations against Ridsdale because the bishop didn't want to share culpability with Pell for allowing Ridsdale to continue abusing children.
"He might have wanted to protect us from his wrongdoing," Pell said. "He might have feared that, if he told us the truth, that people like myself would have said: 'Well, look, is that correct? I am not sure we should be going in that direction at all'."
Ridsdale, now in jail, was moved from parish to parish around Ballarat for more than a decade and continued abusing children. Pell said Mulkearns, who is 85 and dying of cancer in a Ballarat nursing home, lied by not revealing the reason for moving Ridsdale.
- AAP, AP