Salam
The biggest problem with Quran is how people do not let it interpret itself. If you let the verses contextualize each other, for example, you let the verses about past succession:
A collection of verses about succession before Mohammad (s).
Contextualize each other as well as verses to do with Mohammad's (s) successors and family, everything becomes easy in the Quran.
The disciples of Isa (a) are talked about in the Quran but they are volatile. That is why God emphasizes on them to not disbelieve or they will be punished more then any one from creation, after being given food from heaven.
The Ulul-Amr however are not compared to volatile people but to the Ahlulbayt (a) of Ibrahim (a) and by flow are obviously the family of Mohammad (s).
The Quran is multidimensional approach. It talks about the twelve and ahlulbayts in inductive way, to see that the religion has been basically the same thing in all times. It changes a bit but the general foundational structure and method of God is pretty constant.
I tried to appeal to verses talking about the unity of the Twelve including Isa (a) in the people of Musa (a) but aside from these, I've gone through some proofs showing the unity of the station of the family of Mohammad (s) with Mohammad (s) in another thread.
The family of Mohammad (s) are equal to one another in status/rank.
Messages between Messengers are constant. Nubuwa is always a miracle and proof from God though yes Quran is said to the best form of that.
What set Mohammad (s) out is his struggle in God's way. His constant effort. That is part of his personality and leadership is linked to all that. How you strive to lead humanity.
His exceling other Prophets (a) is not due anything novel he said, the Quran says, Mohammad (s) says what all Messengers say, this is not the issue.
It's how he lead, it's the striving, the personality, and the incredible effort he put. Now, Mohammad (s) being Ahmad (most praised) and the Ahmad being Mohmmad (praised without negation) interprets itself that he reached a stage that for creation, as it's praised as it can get. Three of the successors of Mohammad (s) were named with the same name. Imam Ali (a) says "the first of us is Mohammad, the middle of us is Mohammad, the last of us is Mohammad and all of us are Mohammad".
There is hadith from Al-Kafi that highlights that aside from family of Mohammad "(s) being compared to Messengers sent to Bani-Israel after Musa (a) with what people did not like, they were not just a Messenger, but "a Mohammad".
However, despite the caliber of Mohammad (s) being much higher and his family much higher, it's always been the case since Adam (a) till now, that humanity has leaders from God.
Leadership is important and God wants people to come to the leader he appointed. Mohammad (s) superiority to other prophets won't shine in the message as they all the say same thing nor is it the Quran that makes him superior as that is from God and not his words nor writing, but really, it's in his leadership.
But leadership outwardly can only do so much, and so more than that, the family of Mohammad (s) per Quran are the brightest lights. Many Jinn came to Islam after the heavenly realm was augmented not to allow intrusion and which they realized the heavenly realm must be power from God.
The Ahlulbayt (a) were guaranteed something other Ahlulbayts were not, and that is the reminder (Written/Quran) they work with would be safeguarded by God.
This means they have to strive to compliment in which they did in many dimensions and ways.
I've shown a clean definition of an Ahlulbayt and Ulul-Arham, and Qurba and Dul-Qurba, etc, that safeguards that Imam Mahdi (a) is the son of Hassan Al-Askari (a).
The hadiths also numerous in that they name all Twelve names along with him being son of Hasan Al-Askari (a) which is in context of others being born out of the preceding Imam.
There is no current Imam in Bahai Faith and no twelve successors so then
@InvestigateTruth tries to down play Imamate and even give it to the disciples of Isa (a).
I suggest looking up how Quran uses the term Imam, and let people see who God wants for to be leaders of mankind.
Per hadiths, the "light" that disbelievers always try to put out is "the leadership" or "Welayat Ali" (both hadiths exist).