Of the thousands of RBS I have handled from fry to 10"+ over the years, I have not noticed them growing into their mouths. It's been my experience, they have a larger mouth than BG, but not nearly as large as GSF. They are a bit more piscavorous than BG but not nearly as aggressive as GSF. Because they are more fusiform in shape and have a much lower fecundity than BG, I think they make one of the better sunfish species candidates to stock with SMB. I especially like the golden morph form of the RBS.
