It is highly recommended to sacrifice on Eid Al-Adha, but it is not obligatory except on pilgrims in Hajj. The narration you mentioned means the importance of the sacrifice and the great reward of it but does not mean that it is obligatory.
The Twelve Infallible Imams from Ahlul Bayt (AS) did inherit the knowledge of the Prophet Muhammad (SAWA). That is why, their status is from his status as Allah says in Quran ذُرِّيّةً بَعْضُها مِن بَعض A Progeny (of the Prophet) which part from him. Their status is higher than everyone except the Prophet Muhammad (SAWA) who is The Highest over all creatures.
I would like to direct you to something I wrote on my website regarding your important question. Although it is long, but it will hopefully explain this misconception in detail.
The status of all the Infallible Imams (AS) is derived from the status of the Prophet Muhammad (SAWA) which is the highest among all the Prophets before him.
Allah says in Quran: A Progeny every one from them is from the others ذُرّيّةً بَعضُها مِن بَعض
This means that the Prophet's status and his Progeny's status are one from the another.
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