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So maybe it's not so obvious who killed him after all.
But Kadyrov clan is a different story. It‘s getting weaker, its leader has according to some sources serious health problems. Moscow isn‘t keen on seeing another Kadyrov in power in Chechnya. So Chechens are more eager to suppress any attacks on the clan that question its strength and authority.
Sure, Russia could have done this - particularly Kadyrov's people. But so could Ukrainian nationalists.
We executed William Joyce and assassinated many like him, nobody seriously questions the morality of that. They deserved their fates a thousand times over.
Not commenting on whether or not this particular individual deserved their fate, but on a more general level.