Avtars.

Avtarhood would have little meaning if it were not connected with evoloution.
The Hindu proccession of Ten avtars is itself,as it were,a parable of evoloution.
First the Fish Avtaar,
then the amphibious animal between land and water,
then the land animal,
then the Man-Lion Avtaar,briding man and animal ,
then man as dwarf,small and underdeveloped and physical but containing in himself the godhead and taking possession of existence,
then the rajsic,satwik,nirguna Avtars,
leading the human devoulpment from vital rajsic to the satwik mentel man and agagin the overmental superman.
Krishna, Buddha and Kalki depict the last three stages,the stages of spiritual development--Krishna opens the posibility of overmind,
Buddha tries to shoot beyond to the supereme liberation but that liberation is still negtive,not returning upon earth to complete positivly the evoloution;
Kalki is to correct this by brigning the Kingdom of the Hevean(Divine) upon earth ,destroying the opposing asura forces.The progression is stiriking and unmistakable.
As for the lives in between the avtars lives,it must be remembered that Krishna speaks of many lives in the past,not only a few supereme ones,and secondy that while he speaks of himself as the Divine,in one passage he describes himself as a Vibhuti,vrsninam vasudevah.We may therefore fairly assume that in many lives he menifested as the Vibhuti veiling the fuller Divine Consciousness.If we admit that the objevct of avtarhood is to lead the evoloution,this is quite reasonable,the Divine appearing as Avtar in the great transtional stages and as Vibhutis aid the lesser transtions.

Sri Aurobindo...