[annalex]

True, ratification of a synod is not required, but general, perhaps informal, consensus of the Magisterium is required, I believe.

[armydoc]

True, ratification of a synod is not required, but general, perhaps informal, consensus of the Magisterium is required, I believe.

Negative. The Church teaches that the Pope, by his office, enjoys infallibility apart from approval or consensus of any other person or council, formal or informal. Do you have any information to the contrary?