No.
If this were the case, the new articles would not have been made. The Papacy was losing the grip on Europe.
Yes.
The papacy as it is in its present form did not exist until much later.
The Papacy did not have supreme, immediate, ordinary and universal jurisdiction for 1,400 years.
As already showed in The Council of Constance 1414-18:
Sacrosancta, 1415
In the name of the Holy and indivisible Trinity; of the Father, Son, and Holy Ghost. Amen. This holy synod of Constance, forming a general council for the extirpation of the present schism and the union and reformation, in head and members, of the Church of God, legitimately assembled in the Holy Ghost, to the praise of Omnipotent God, in order that it may the more easily, safely, effectively and freely bring about the union and reformation of the church of God, hereby determines, decrees, ordains and declares what follows: - It first declares that this same council, legitimately assembled in the Holy Ghost, forming a general council and representing the Catholic Church militant, has its power immediately from Christ, and every one, whatever his state or position, even if it be the Papal dignity itself
, is bound to obey it in all those things which pertain to the faith and the healing of the said schism, and to the general reformation of the Church of God, in bead and members. It further declares that any one, whatever his condition, station or rank, even if it be the Papal, who shall contumaciously refuse to obey the mandates, decrees, ordinances or instructions which have been, or shall be issued by this holy council, or by any other general council, legitimately summoned, which concern, or in any way relate to the above mentioned objects, shall, unless he repudiate his conduct, be subject to condign penance and be suitably punished, having recourse, if necessary, to the other resources of the law. . . . *
This is later confirmed in the
4th Session at the Council of Basel (June 1432):
The holy general synod of Basel, legitimately assembled in the holy Spirit, representing the universal church, bears in mind that it pertains to the duty of providence to foresee the future with clear-sighted consideration and to take wholesome steps against what could bring harm to the common good. The synod is intent upon the extirpation of heresies, peace among the people of Christ and the reformation of morals, with the grace of the holy Spirit, as is really necessary in view of the present situation. It has summoned the venerable fathers in Christ, the cardinals of the holy Roman church, to this sacred council, convinced that their presence at it is fruitful in many ways in view of their authority, wisdom and knowledge of affairs. If, then, as obedient sons they are coming to the council when the apostolic see falls vacant elsewhere, such a situation would redound to the benefit of the church but the obedient cardinals would be serving the council to their own disadvantage, whereas everyone knows that obedience should bring with it not disadvantage but an increase of benefit and honour. Lest disobedience may seem to be to the advantage of some who fail to come, this holy synod, with purposeful anticipation and for the above and other reasons which can and should motivate a prudent mind establishes, decrees and defines that, in the event of a vacancy of the apostolic see while this sacred council is in progress, the election of the supreme pontiff shall be held in the place of this sacred council, and it forbids it to be held elsewhere. The synod also decrees that any attempt against this by any authority whatsoever, be it even papal, notwithstanding any constitutions issued or to be issued or anything else acting to the contrary, even if there should be special mention in so many words or a confirmation on oath, which the synod rejects with full knowledge, is null and void and of no force or importance by law; and that those who attempt such things shall be disqualified in both active and passive voice with respect to the election of a Roman pontiff and for every other dignity, and deprived perpetually of all dignities which they hold, and shall automatically incur the mark of infamy as well as sentence of excommunication.
The problem the Papacy had at the time (14th-15th centuries) was that there were 2 Popes and 3 Popes later at the same time. And the college of Cardinals from all parties, through the Council settle the matter. In the very same way it was done in the first 7 Ecumenical Councils, where NO Bishop was over all other Bishops and the Council was over the Whole Church and any Bishop.
The final shape for the current Papacy was taken in Vatican I (1870 AD), where conciliarism is ruled out and the supreme, immediate, absolute, ordinary, universal power of the Pope is then determined.
And what is used to support this development (almost exclusively because it lacks elements from Sacred Tradition to supported it enough):
Sacred Scriptures, in like manner of our Protestant brothers.
All of a sudden our Eastern brothers, most of which are native speakers to the Greek and Hebrew, are unable to receive and interpret this new revelation in regards to Church government.