Socci: Francis wants "'Rehabilitation' of Martin Luther" & Benedict wanted Ambiguous Union with the Eastern Orthodox Churches
Antonio Socci in "The Secret of Benedict XVI" makes the case that 
Benedict XVI in his ecumenical dialogues with the Russian Orthodox 
Church specifically with Russian Orthodox metropolitan Bishop Hilarion 
Alfeyev was talking about being ambiguous about the primacy of the 
papacy.
Hilarion is quoted in the book:
"Ratzinger has made enormous efforts to clarify the question of the 
primacy of the bishop of Rome, shifting the emphasis from a juridical 
vision of primacy to understanding [the pope] primarily as a Christian 
witness of a particular type and as a service to unity in love"
(The Secret, page 27)
Socci says Benedict's goal is "the opposite pole from the 
'rehabilitation' of Martin Luther attempted by Papa Bergoglio 
[Francis]... 'on the Eucharist and the Liturgy."
(The Secret, page 28)
Apparently according to Socci while Francis wants some type of union 
with liberal Protestantism and is willing to sacrifice the "Eucharist 
and the Liturgy" in this apparent heretical goal, Benedict wanted union with the 
Eastern Orthodox Churches and seemed ready to be ambiguous about the 
infallible teaching of Vatican I.
The First Vatican Council infallibly taught as quoted by Legatus:
"[T]he Roman Pontiff holds primacy over the whole world... [is] head of the whole Church."
(Legatus, "What is papal primacy?," May 2, 2013)
The Legatus article "What is papal primacy?" says:
"Papal primacy... [is] universal jurisdictional authority to govern the 
Church... The Eastern Orthodox Church considers the bishop of Rome to 
have [only] a primacy of honor... They do not recognize his primacy in 
jurisdiction."