Advice: Why don't YOU do a research! Check out the websites of all schools you want to attend (both Caribbean and Ireland). Look at their match lists, hospital affiliations, coursework, student profiles, etc. Then, YOU can make an informed decision based on the facts! People have their own opinions which may or may not be accurate (even your advisor). The fact that you didn't even know that DO has their own residency programs means that you have not done enough research on your own. Ortho is an extremely competitive residency even for US grads. So, if that is the only specialty you want to do, I would suggest that you do whatever it takes to get into a US school (post-bacc, grad school, multiple MCAT's, volunteer, etc.). If you somehow choose to attend a foreign med school (either Caribbean or Ireland), you should know that there's a chance you might not get your first choice of residency.
PS: Ross is a great Caribb school (along side SGU, SABA, and AUC). Coming out from Ross is as good as coming out from any other top Caribb schools.