Marc Cardinal Ouellet, 68, Canada
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The former Archbishop of Quebec, who now heads the Congregation of Bishops, has a deep knowledge of the global workings of the church, Bunson said.
"He has had a major role in the appointment of the church's leaders around the world," Bunson said.
And he points out that at 68 years old, Ouellet has age on his side.
Ouellet is someone who could have "worldwide reach," Alvaré said.
"The man who is chosen for the position he has is someone who is understood to have the presence and the future of the church in mind," she said.