To me, "adequate" for a major leaguer indicates an ability to throw a baseball with velocity and accuracy I could only dream of. I can't even imagine throwing a baseball like Sano. My arm would fall right off. Heck, even Sano's arm got hurt. TJ surgery for a third baseman... yikes. Mainly, it looks like Polanco's arm will suffice for most plays at SS. But if he goes deep in the hole, he won't throw out a fast man. Escobar's arm is stronger. Also, I hear Engelb Vielma has a gun, and same goes for Nick Gordon, somewhere down the line... Good news, Polanco can play three infield positions, and hits lots of line drives!