If the Herons land Medina on top of their already otherworldly roster, their XI - on paper - is instantly the best across MLS. The 19-year-old is regarded as one of the top prospects out of South America and has also attracted European interest. However, sometimes one player's influence is all a club needs, and if there was ever someone who could lure a young, talented Argentine to South Beach... it's Lionel Messi.