In chapter 2:20 we read:
[Asad] When your Lord said to the angels, I am putting a successor on earth, they said, Will You place someone there who will cause corruption on it and shed blood, while we glorify You with Your praise and extol Your holiness? [God] answered, Surely, I know that which you do not know.
The word Khalif has been translated by different translators as:
Successor, viceroy, vicegerent, overlord, supreme religious head, inheritor, deputy, representative, ruler, generations after generations, etc.
If the meaning of Khalif falls more near to successor, then the question arises who the successor succeeds? Is it possible that there existed a generation of humans through an evolutionary process who this 'new' generation would succeed? A new generation with better intelligence and abilities? We also need to keep in mind the concerns raised by the angels here who must have seen the way mankind behaved!
Any comments?