1)
Why did they bring him to Eli after slaughtering the bull?
1.
Rashi: This was to show that his prophecy was fulfilled.
2.
Rashi citing Brachos 31b: Shmuel taught a Halachah, that a Zar may slaughter Kodshim. 1
3.
Radak: After offering the Korban, they brought him to learn in front of Eli, and Eli would train him in Torah and Mitzvos.
4.
Malbim: This was to show that just like the bull is a Korban to Hashem, so the youth will be totally to Hashem, for service.
1
Radak: This is difficult.
