Pittsburgh Pirates Prospects: Debating Who Should/Should Not Be Available in Trades

What top Pittsburgh Pirates prospects could be avaiable in trade talks?
Pittsburgh Pirates Photo Day
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What top Pittsburgh Pirates prospects could be available in trade talks with other teams?

It seems more and more likely that if the Pittsburgh Pirates are going to make any significant addition to their roster, it is going to be via trade. They definitely have a deep enough farm system that they could make a move right now and add an impact arm or bat. But if the Pirates make any sort of trade over the coming month before Spring Training, which top prospects should they make available? Are there any untouchable prospects?