If they see you work hard and get along with you = bumped up. If you are lazy and suck = wasted time rotating. Just like every other program in the country!
Seriously they have not had that many IU spots in recent years. I doubt they have any "reserved" either.
intj

IU is interested in rotators and home students just like every other program. They are known commodities. From what I have heard in the past year or two most IU students chose to go elsewhere.

Indiana has 5 spots per year. It looks like it ranges from 1-3 home students per class. Rumor has it there's a larger than normal ortho class from Indiana this year, so may depend on how many want to stay VS go away for residency.