It's saying more and more than there are both anatomical (structural) and functional (the way it's used or operates) differences in the brains of both children and adults who stutter. I think this research is particularly encouraging because I think it goes a long way to show that it's not someone's fault that they stutter... it's nothing their doing, have done, or haven't done that is their fault they are someone who stutters. The "advantage" part of your question is harder to answer and think about... I think it's harder to answer because stuttering is still mostly seen as a disorder by most researchers and not a neurodiverse difference. So, researchers tend to investigate stuttering through the lens where "normal" or the "comparison" is people who don't stutter. Yet, I will say that there is new research showing that some children who stutter develop high rates of resilience, and this protects them from experiencing stuttering as negatively as they would have otherwise, but that's not exactly "brain" research.