Well, while I have heard a lot about the avatars of Vishnu, I have not read about the others you mentioned in your link. I don't think Narada, Balarama and Buddha are avatars of Vishnu.
Balaram is described in the Mahabharatha as a incarnation of the serpent deity Ananta Shesha.
And Buddha has never described himself as an avatar, and allowed himself to be worshipped. He also never advocated the worship of God or gods, but instead emphasized self-reliance .
Here is an excerpt from an article.......
There are two type of avatars, primary avatars and secondary avatars. The most common type of primary avatars are called Svarupavatars, in which He manifests Himself in His Sat-cid-ananda form. In the primary avatars, such as Narasimha, Rama and Krishna, Vishnu directly descends. The Svarupavatars are subdivided into Amsarupavatars and Purna avatars. In Amsarupavatars, Vishnu is fully present in the person of the organism but He is manifest in the person only partially. Such avatars include the first five avatars from Matsya to Vamana except for Narasimha. Narasimha, Rama and Krishna, on the other hand, are types of Purna avatars, in which all the qualities and powers of the Lord are expressed. Narasimha and Rama are also additionally considered to be Lila avatars. Other avatars are secondary avatars, such as Parashurama in which Vishnu does not directly descend. Parashurama is the only one of the traditional ten avatars that is not a direct descent of Vishnu. There are two types of secondary avatars: 1) Vishnu enters a soul with His form. (e.g., Parashurama) or 2) Vishnu does not enter a soul with His own form, but gives him extraordinary divine powers. (e.g., Veda Vyasa.) The secondary avatar class is sometimes called Saktyamsavatara or avesha avatar. Note that the secondary avatars are not worshipped. Only the direct, primary avatars are worshipped.
So we can see from this that the dasavatars , except for Parashurama, are a manifestation of Vishnu in his full sat -chit - anand form, and are known as svarupavatars or the primary avatars.
Even with the exception of Parashurama, the svarupavatars of Vishnu show a striking resemblance to the biological theory of evolution.
As for how these dasavataras have been conceived, I have a theory.
I believe a yogi or a scholar, who have accessed his superconscious mind or was in a state of peak intuition , must have wrote this down.
For more information on the superconscious mind , check my thread on 'The real cause of Islamic terrorism', in the Hot Topics forum, or in the Raja yoga forum ( Patanjali).
I would like to know your comments regarding that.
Thanking you,
Niranjan.
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