Can a human being declare self as Bhagavan? A self realized soul all the time worked for welfare of entire mankind. A self realized soul can never open a hermitage (ashram) of one’s own. Mahavira, Gautama Buddha even Jesus Christ and Prophet Mohammed never had such a hermitage. Even Sri Ramakrishna Paramhansa and Maharshi Ramana always lay on a cot in open answering queries of seekers.
Journey of self realization means serving God and in serving entire humanity we were directly serving God Almighty. So many people in the entire world declared themselves as Bhagavan Kalki. Self declaration in field of self realization is not necessitated. The world will recognize the achievements of its own. We need not repeatedly say what we are.
The true Kalki Bhagavan, Kalki Avatar would manifest shortly probably in the next decade. We can see and perhaps meet Kalki Avatar in our lifetime.
Apart from being well versed in the jnana wisdom contained in Bhagavad Gita and Upanishads (independent spiritual treatises), Kalki Avatar would also manifest administrative powers possessed by Chanakya (the most able administrator in the entire history of mankind). To save lives of millions Chanakya got 100 kings eliminated in one night.
Such ruthlessness can be practiced only by a true crusader of truth and only truth.
To re-establish Dharma (righteousness) if a few need to be eliminated, Kalki Avatar would successfully do so. A single bad apple spoils the broth, the whole basket and so does a bad element in the society. To usher mankind into Satyuga, the awaited golden period Kalki Avatar would leave no stone unturned. All his efforts would ultimately prove beneficial for mankind.