No, I perfectly understand plea deals, how they work and the sorts of things that can impact them. Just saying that, in this case, any plea deal that eventually gets worked out is unlikely to be impacted in any way by the firefighting. The case is so solid that any plea deal will be driven more by Rugg's history of behavior (if that helps), the presence of his daughter, the overcrowding in prison, or the business of the court schedule, or something pragmatic like that.
Lots of stuff can impact a plea deal to reduce the sentence and avoid a trial. The firefighter "straw" ain't likely to be one of them.