The concerns you try to raise i have already answered in the post you quote - maybe try reading it.Honestly because your assertion involves Russia leaving this man in place for years to apparently work against their interests. You claim this to justify your theory that somehow Russia was manipulated into backing Serbia.
You also haven't provided evidence for either claim you've named dropped some books.
It is you who has provided neither books nor sources - nothing but your own theories. The books I mentioned claim he went rogue - while citing sources. Maybe you should try to provide something more substatial than your theories if you are so sure he did not?