In short, whereas the Perfect Master establishes his circle, the Avatar is directly allied with his inner circle, which is always the same [in regards to roles] in all his advents. With his descent on Earth, the Avatar, as it were, brings along with him the association of his inner circle.
The connection of the inner circle in relation to the Avatar may be compared to that of a man who directly associates himself with the 14 parts of his own body — two eyes, two ears, two nostrils, one mouth, two hands, two legs, and the trunk of the body itself; plus the external genitals and anus that act as the appendage to the body as a whole. As soon as a man is born, he directly makes use of these 14 parts of his body, and these parts, in turn, respond to his dictates individually and collectively.
Similarly, with the advent of the Avatar on earth, his inner circle of the same 12 [types of] individuals and the appendage of the same two individualities directly begins to function, individually and collectively, according to the dictates of the Avatar himself.
With every advent of the Avatar on earth, the 12 men of the inner circle and its appendage of two women gather round the personality of the Avatar, as the selfsame 14 types of individualities, who in the shape of different personalities, always occupy their respective offices when the Avatar manifests on earth. And, during and after the lifespan of the Avatar, they individually and collectively function in the same way as their predecessors, who had held and functioned in the same offices of the inner circle during the past advents of the Avatar.
Therefore, it would not be wrong to say that with Christ's coming again come Peter, Judas, and all his apostles. But, this can never mean that the very same Peter, or the selfsame Judas, reincarnates again and again. These can never incarnate, because all of the 12 individual personalities of the Avatar's inner circle attain God-realization in every Avataric period, either during or soon after the lifespan of the Avatar.
Once God-realization is attained, reincarnation is impossible. The only exception to this rule is the Avatar himself, who comes again and again to redeem humanity.
It is not the same individualized personalities of the inner circle that reincarnate; it is the individualities of their particular offices that come with every advent of the Avatar.