noone's saying that you don't submit your transcripts, and they don't see that you do your basic science in the caribbean. you tell them you graduated from a US school and you tell them you transferred from the caribbean, but it doesn't matter because you got your degree from a US school. in other words, a US school certified that you received a medical education that meets their LCME-approved standards. and that's all that matters.
of course, i could still be wrong. i'm just trying to make sense of things from what i'm reading here. the confusion seems to stem from the belief that where you do your basic science defines whether or not you are an FMG. maybe if you found an official document supporting that, it would clear things up, but i imagine finding an official document on a topic this specific would be hard to do.
here's a vmd thread that seems to relate to this, where most seem to agree. i know it's hardly proof, but it's all i could find. strangely enough, i think the OP in that thread is referring to this thread.
http://www.valuemd.com/residency-match-forum/125696-funny-post-about-transfers.html