I have one of these on my team right now, and he has caused me more sleepless nights than anyone I have ever met. Finding it very difficult to get mgmt to understand that most of his code needs to be re-written

This may sound paranoid, but I have seen it happen: make sure the person you are having problems with isn't sucking up to your managers and also making you look bad to them.

[99% of the people I have worked with have never played those kind of political games but I have seen the utter chaos that can happen if a politically savvy operator is let loose in a trusting and politically naive environment.]

Frankly, if that works and you get fired, you didn't lose much to start with. Sorry, but keeping your job is a different skill set than doing your job.

I've had to opposite experience twice - I got drop-shipped into projects where somebody had gone rogue and I cleaned it up, and then they were let go. It's most unpleasant, and had they been more perceptive they'd have known that's what was going on. In both cases, I believe they were ready to go ( and I lost any trust in the management that used this gambit and left myself shortly).

Valuable advice, said individual has indeed already tried this approach with my immediate managers and my peers. Luckily I've been here long enough to have a reputation that can't easily be besmirched