Rape by Instrumentation is not a lesser charge. It carries the same penalties as 1st Degree Rape the only difference is the perpetrator used a inanimate object like a finger or anything else other than his penis to penetrate the victim. In this case no charges where cited on the original booking until later when they listed it as First Degree Rape which was then changed to what it is now, Rape by Instrumentation. This, in my opinion, shows a lack of professionalism and reflects directly on whoever filed the first charges be it the DA's office, Creek County or the agent who made the arrest.
I'm sorry. I didn't mean for my comment to imply that Rape by Instrumentation was a lesser charge, but in many cases, major arrest charges are not filed and lesser charges are instead. But, you are right that R by I is NOT a lesser charge than Rape.