Sorry but this is a really dumb thought-experiment. First off, you're assuming that students with 37 MCATs are naturally more gifted than students with lower MCATs. I know that the MCAT the star around which your pre-med solar system rotates, but you'll be shocked to hear that no one gives a crap about it once you start med school. The slate is clean. I know people who scored in the 40s on their MCATs and I, despite my lowly 35, outscored them by a standard deviation on Step 1. The correlation between MCAT and Step 1 is pretty weak, and you're assuming a lot if you think having a 37 MCAT automatically makes you a top-dog in med school.
Secondly, your notions about being the smartest guy in the classroom means you can slack off and still set the curve is pretty naive. Those people do exist, but they're naturally gifted. It's not like getting a 37+ MCAT lets you into the "slacker genius" club. Also, the idea that this slacking off gives you more time to "prep for Step 1" shows that you don't really know much about how med school works. I won't hold it against you, as you are a pre-med. More time studying =/= higher Step 1 score. If it did you all would be studying for it now.
Next, a massive Step 1 score doesn't off-set the Caribbean stigma. The most prestigious and competitive residency programs in any given field, as well as the entirety of some fields (like ENT, urology, integrated plastics, derm), will never look at a Caribbean grad's application. They can fill their spots with well-qualified US MDs any day of the week. Step 1 score is not the end-all-be-all, and getting an astronomical score doesn't guarantee you get any residency that you want. You also have to be a well-rounded candidate in other ways, and one of those ways is where you go to school. At top tier residencies, being a Caribbean grad alone cuts you from the pack. That's just the way it is.