I greatly appreciate any opinions and advice on a potential trade that I am contemplating. Our league is a standard 5X5 keeper league with 13 teams. No contracts or salary so we can keep guys as long as we want. The offer is:

I get OF Wil Myers

I give 1B Anthony Rizzo, C Ryan Lavarnway, RP Rex Brothers

I have very good 1B depth with Miguel Cabrera, Kendrys Morales, Brandon Belt, and Mat Gamel. We start 2 catchers and I have Posey and not much else (Salvador perez). My OF is pretty weak. My 5 starting OF are Adam Jones, BJ Upton, Logan Morrison, Domonic Brown, and Rick Ankiel. My only OF prospects of note are Matt Szczur, Michael Taylor (OAK) and Ryan Kalish. My big hang up is with Brothers. Closers are at a premium in our league. I know closing is more about opportunity than anything else so that is my main question for the panel, Do you think Brothers can become a closer and keep the job? Secondly, closer or not, should I do this deal anyway? My team is still a few years away from contending for a title so I can always try to trade for closers when I get closer to my window for contending. Thanks again for any insight.