CCOM rotating with Rush and UIC students
Sure, CCOM has rotations at Cook County, Advocate Christ, and Advocate Lutheran General where they will rotate with UIC and/or Rush students, but again, you're kidding yourself if you think that all of the rotations at CCOM are in these hospitals. CCOM is amongst the best when it comes to quality of rotations, but there are still many other places that their students rotate at that are not of this caliber.
Nova students rotating with UF students
Again, how many students actually end up at this rotation site? Nova also has many sites that are at small community hospitals, or preceptor based. Like CCOM, you have to give Nova credit for at least trying their hardest to secure strong sites.
"Freedom to design your own fourth year"
This is because DO schools realize their limits and outsource the job of finding clinical rotations to their own students under the guise of 'freedom to design your own fourth year'.
This 'freedom' is important however as it is often what lets DO students match into competitive ACGME programs, as it gives them exposure to such programs, and the ability to get an LOR from these programs.