Seeing as all the Nesi'im brought identical Korbanos, why does the Torah repeat the Korbanos of each Nasi? Why does it not present the details of Nachshon's Korban, and continue 've'Chein Hikriv ... ' for each subsequent Nasi on his day?
Ramban (on Pasuk 2 #1) and Moshav Zekenim (on Pasuk 84): Hakadosh-Baruch-Hu confers honor upon those who fear Him. Consequently, bearing in mind that all the Nesi'im thought to bring their Korban and to inaugurate the Mizbe'ach simultaneously, and that it was impossible for each Nasi to be the first to bring, Hashem honored all of them by repeating all the details by each one.
Ramban (on Pasuk 2 #2), R. Bachye #1 (on Pasuk 84) and Moshav Zekenim (on Pasuk 84) - both citing a Midrash: Because each Nasi had a different reason in mind - one that was relevant to his tribe. 1 2
Ramban (on Pasuk 2 #3): Because, based on a tradition that Ya'akov handed down to each tribe what would happen to it until the time of Mashi'ach, each Nasi brought Korbanos that pertained to that tradition.
R. Bachye (on Pasuk 84 #2): Because the Korbanos of the twelve tribes represented the twelve Galgalim (spheres of the zodiac), each of which revoves independently ? which also eplains why they each brought a round dish.
Seforno: To teach us that each Nasi had in mind to atone for the specific sins of his tribe, and that therefore, each Nasi's Korban was accepted individually with goodwill by Hashem. 3
Oznayim la'Torah: To demonstrate the deep humility and the unity of the Nesi'im who did not try to outdo each other in order to show-off their wealth in front of the people, as is the way of the aristocracy in similar circumstances.
Ramban: Consequently, Nachshon's Korbanos were connected to Malchus, (as we explained - from Pasuk 13 - 18), Yisachar's to Torah and Zevulun's, to Parnasah (See Ramban, DH 'u'Nesanel' and 'u'Zevulun'). See R. Bachye, wwho actually goes through the reasons of each of the twelve Nesi?im.
R. Bachye: Even though the Nesi?im were destined to sin by the episode of Korach, Hashem judges a person according to his deeds at any given moment, and they had not sinned yet. Consequently, since the princes honored Hashem, He honored them.
Seforno: And each Nasi stood by his Korban - like the Ma'amados -where representatives of the community stood by the Korbanos Tzibur whilst they were being sacrificed on the Mizbe'ach.
Why does the Torah write "Hikriv Korbano" by Nesanel ben Tzu'ar and not be any of the other Nesi'im?
Rashi (on Pasuk 19) and R. Bachye: Because the tribe of Reuven claimed that, if Yehudah preceded them, they ought to come next, since Reuven was the firstborn. So Moshe informed them that he was merely following Divine instructions - to go after the order of the Machanos, in which case, Yisachar had to follow Yehudah. 1
Da'as Zekenim: According to order of birth, Yisachar should not have offered after Yehudah; they merited to do so however, due to their superior Chochmah. 2
Hadar Zekenim: According to the order of birth, Nesanel should not have offered after Yehudah, only they pushed themselves forward however, in order to do the Mitzvah.
Sifri: Since Nesanel merited a high level of understanding (Binah), 3 the Torah reckons as if he had brought first.
R. Bachye: As the Pasuk writes in Divrei ha'Yamim 1, 12:33 "u?mi?Benei Yisachar Yod'ei Binah le'Itim".
Da?as Zekenim: As the Pasuk writes in Divrei ha'Yamim 1, 12:33 "u?mi?Benei Yisachar Yod'ei Binah le'Itim".
See answer #2. See also Torah Temimah note 20.
