VATICAN CITY (AP) -- Two pontiffs, both wearing white, both called "pope" and living a few yards from one another, with the same key aide serving them.
The Vatican's announcement Tuesday that Pope Benedict XVI will be known as "emeritus pope" in his retirement, be called "Your Holiness" and continue to wear the white cassock associated with the papacy has fueled concerns about potential conflicts arising from the peculiar reality now facing the Catholic Church: having one reigning and one retired pope.
Benedict's title and what he will wear have been a major source of speculation since the 85-year-old pontiff stunned the world and announced he would resign Thursday, the first pope to do so in 600 years.
There has been good reason why popes haven't stepped down in past centuries, given the possibility for divided allegiances and even schism. But the Vatican insists that while the situation created by Benedict's retirement is certainly unique, no major conflicts will arise.
"According to the evolution of Catholic doctrine and mentality, there is only one pope. Clearly it's a new situation, but I don't think there will be problems," Giovanni Maria Vian, the editor of the Vatican newspaper L'Osservatore Romano, said in an interview.
Critics aren't so sure. Some Vatican-based cardinals have privately grumbled that it will make it more difficult for the next pope with Benedict still around.
Swiss theologian Hans Kueng, Benedict's one-time colleague-turned-critic, went further: "With Benedict XVI, there is a risk of a shadow pope who has abdicated but can still indirectly exert influence," he told Germany's Der Spiegel magazine last week.
The Vatican spokesman, the Rev. Federico Lombardi, said Tuesday that Benedict himself decided on his name and wardrobe in consultation with others, settling on "Your Holiness Benedict XVI" and either "emeritus pope" or "emeritus Roman pontiff."
Lombardi said he didn't know why Benedict had decided to drop his other main title: bishop of Rome.
In the two weeks since Benedict's resignation announcement, Vatican officials had suggested that Benedict would likely resume wearing the traditional black garb of a cleric and would use the title "emeritus bishop of Rome" to avoid creating confusion with the future pope.
Adding to the concern is that Benedict's trusted secretary, Archbishop Georg Gaenswein, will be serving both pontiffs -- living with Benedict at the monastery being converted for him inside Vatican grounds while keeping his day job as prefect of the new pope's household.
Asked about the potential for conflict, Lombardi was defensive, saying the decisions had been clearly reasoned and were likely chosen for the sake of simplicity.
"I believe it was well thought out," he said.
Benedict himself has made clear he is retiring to a lifetime of prayer and meditation "hidden from the world." However, he still will be very present in the tiny Vatican city-state, where his new home is right next door to the Vatican Radio transmission tower and has a lovely view of the dome of St. Peter's Basilica.
Kueng said it was a mistake for Gaenswein to serve both men and for Benedict to remain so close to the center of action.
"No priest likes it if his predecessor sits next to the rectory and watches everything he does," Kueng was quoted as saying in Der Spiegel. "And even for the bishop of Rome, it is not pleasant if his predecessor constantly has an eye on him."
However, others reasoned that Benedict's retirement plans and title were in keeping with those of other retired heads of state.
"I was somewhat surprised that Benedict would still be called 'His Holiness' and would wear white, but it's akin to the former U.S. presidents being addressed as 'Mr. President,'" said the Rev. James Martin, a Jesuit writer and editor. "It's a mark of respect for the former office he once held."
"Overall, I don't think that after the conclave there will be any doubt about who the pope is, or who is in charge," he said.
While Benedict will no longer wear his trademark red shoes, he has taken a liking to a pair of hand-crafted brown loafers made for him by artisans in Leon, Mexico, and given to him during his 2012 visit. He will wear those in retirement, Lombardi said.
Lombardi also elaborated on the College of Cardinals meetings that will take place after the papacy becomes vacant -- crucial gatherings in which cardinals will discuss the problems facing the church and set a date for the start of the conclave to elect Benedict's successor.