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The walks are microscopic, but in order to keep them low he's getting hit around. 73 base runners in 50.1 IP in Rookie League is not good enough to achieve top prospect status on stats alone. Carlos Silva had some years where he didn't walk anyone at the MLB level, but that didn't make him a top SP. Certainly nice to have as many 'interesting' minor leaguers (like Unsworth) as we can in our system, but at this point he's not someone on the radar.