After the past 2 years I'm less convinced than everyone else that a prospect will suddenly perform at a high level upon call-up. Polanco has hit so far in a SSS. That, plus Polanco has positional flexibility and is getting plenty of at bats now. After literally decades of futility in the middle IF, why trade the second there's a third capable player in the mix. If anything, I'd still look to move Escobar and cross my fingers that Polanco can be near league avg at SS defensively. What risk? The risk that you trade a quality starting 2B for an Alex Meyer who can throw hard, but little else.