Heh, one of the more original approahces I've seen for resolving the problems with Tom; fairly compact and economical solution, too. It'd be interesting to see a sequel where Ron tries to get back with them and finds that he's burned his bridges most thoroughly and nothing will/can rebuild them. I rather suspect that'd also leave him open to abuse from his sibs; I suspect not even Percy would support this. Of course, with Tom provably dead, I wonder how fifth year would go since Fudge has no reason to attack Harry and every reason to try and get on his good side.