> No, the reason I mentioned "they sucked" is that for an experienced politician killing his less dangerous opponent is a very stupid move. It wouldn't give any profit but will definitely harm the reputation. Сui bono tells us to search for another beneficiar.

Yet he spends 0 effort on finding the guilty parties when journalists/political opponents die. That you actually attempt mental gymnastics trying to explain it in more convoluted ways tells me that the Kremlin propaganda machine works.