Counter-theory: he’s needed. Other user said as an example, I’d say as a symbol, to castrate the weak opposition they have, as they aren’t ready to move on and pick someone else for he’s still there. His former allies made a cargo cult out of his martyrdom, chanting freedom to him as their main message, while it’s impossible and rather pointless. He’s there to attract attention, that’s why information from him and about him leaks from what is basically a solitary confinement. He’s a carrot before the donkey’s nose. And this non-trivial amount, and also the world care too much about this involuntary token figure. I don’t think he is a plant, but a useful hostage he is. And I think he understands that.