Well, I can see why you are saying these things. Gessen and Kasparov are very poor sources on Putin and Russia.
Putin went on a local television program and announced that he had been in the KGB and was resigning. He did this so that it could not be used against him. There is absolutely no evidence that Putin was an assassin or any of the other things you are repeating. In another post, I mentioned two very solid sources of information on Putin by independent scholars.