I've had someone take over the Plot of an RP before, partially through overpowering and loopholes in the way that I set it up originally. It was my first time being a GM so I wasn't sure what to expect. Having a guide on how to deal with that scenario and how to avoid it would have been really helpful at least.

The other problem was that if and when I did boot the person, the RP crashed because we had all written in a way that encased all the characters into an event in a major section, and without that person it just all fell apart so easily (Not to mention the giant argument that arose from RPers about each other that caused me to throw in the towel).

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So, on the flip side, I can offer some help if need be as I have some experience with some of the nastier side of things.