You know what this is called? An orgy of evidence, so much evidence pointing to a regime act, that in all likelihood it is actually been staged to look like that. Or it could be a double bluff, because what are the Russian's going to say first? That the CIA made it look that way.
Yes its quite puzzling. I mean
1. it contradicts the initial claims of the car coming from an area on the border with Chechnya
2. its just too obvious as you say
3. it could be used to point to the opposition "doing it themselves as a false flag" (and i wince as i type FF) but it cuts down massively on most of the other "alternative" suggestions presented by putin as well
4. Well they havent exactly been subtle in the ukraine, I mean everyone is essentially acting and talking as if its a fact russia is there, even top officials so deniability has kinda gone out of the window.
5. If the killing was a warning to other dissenters this is the link that makes sure people know it was the government if they had any doubts but leaves enough deniability (not directly from the government, could have been stolen etc)
Very interesting piece in Janes looking at the russian military side of the conflict.
http://www.janes.com/article/49469/update-russia-s-hybrid-war-in-ukraine-is-working