Time to add Amed Rosario in fantasy?

Is New York Mets prospect Amed Rosario worth adding to rosters right now? Butch Dill-USA TODAY Sports

The New York Mets have resisted the urge to call up top prospect Amed Rosario because they think he needs more time at Triple-A Las Vegas. In some ways this makes perfect sense because Rosario turned 21 in November and hasn’t even played 21 games above the Double-A level. Then again, these Mets fancy themselves as