You can't be serious. Why would a program take a person who could not get into a US medical school?
I'm an american allopathic grad but did a transitional intern year. The categoricals were all FMG's, carribean grads, and DO's. The "Indians", "Hungarians", and "Korean" residents you speak of would hit 99 percentile on all the in-service exams while the remainder got lost walking to the cafeteria.
It was embarassing.
The only thing holding the FMG's back was the language barrier, but that dissapears as the years go by. I'm sure there are a small % of decent carib grads, but every one I worked with was, lets say, subpar.
I had the same perception as you before I did my intern year, but after working with the true FMG's, I was actually pretty impressed. The "American" carribean grads not so much.
Again, the FMG's that come here are academically near the top of there respective countries, the "American" carribean grads are obviously...not.