B. To understand answer of the B part of your question we have to discuss Avatar i.e. Incarnation. According to Shuddhadvaita Brahmavada entire creation is the manifestation of the supreme reality, Brahma Itself. In this view everything and everybody is in fact Avatara. In spite of this we see considerable difference among beings. This happens due to the manifestation and concealment of the attributes of Brahma in respective beings. Where divine attributes of Bhagavan are manifested in greater amount, is called Avatar. In the third chapter of the first Skandh of Bhagavat Purana subject of Avatar is discussed in detail. Here, after describing 24 Avatar, right from Sanat-Kumar to Kalki, Sutji says "As water flows in numerous channels from a dam similarly there happens countless Avatar of Bhagavan". Therefore, there is no fix number of Avatar. 10 or 24 Avatar are popular more because they are more powerful and its description is available in the scripture. Avatars are of three types mainly. They are as follows: 1. Purnavatara: When Bhagavan Shri Krishna with all his perfect potentialities alights on the earth, that incarnation is called the Purnavatara (The Perfect Incarnation). Only Shri Krishna-avatara is the perfect incarnation. 2. Amshavatara: When Bhagavan Himself does not incarnate but manifests some of his attributes on the earth, that incarnation is called the Amsavatara (The Partial incarnation or the incarnation of the phase or the attribute). For example: Vedavyasa who composed all Vedas and Purans and who divided Vedas in different sections is the incarnation of Bhagavans attribute of Knowledge. 3. Avesavatara: When Bhagavan enters into someones body for doing some specific work, it is called the Avesavatara (The incarnation of the Entrance. This kind of entrance is restricted only to some specific work. Parashuram is the incarnation of Entrance of Bhagavan Shri Krishna. Now, I think, question does not remain unsolved whether Sri Vallabhacharya was a Swaroop of Bhagavan Shri Krishna.