If it can use anyone - and it can - one less host doesn't mean anything to it.

[ And right, the coming back thing. That's still true, nothing that happens here is permanent (though there is the 1% true death chance, isn't there?) but that doesn't change the fact that dying is still highly unpleasant. ]

Bradbury's right. Killing him isn't anywhere near a permanent solution. The only thing that will work is finding a way to keep that thing out of him.