Maybe the New York Mets can pull the whole thing off and sign free-agent center fielder Michael Bourn without losing their first-round pick. David Prouty, executive counsel of the players’ union, told The Boston Globe that he is in talks with baseball regarding the Mets’ desire to keep their pick if they sign Bourn. One source with knowledge of the discussions said the team stands a “decent” chance of winning its argument that its first-round choice should be protected. (The Mets had the 10th-worst record in the majors last season but fell to No. 11 — the first unprotected pick — when the Pittsburgh Pirates did not sign their first-rounder and, as compensation, moved back into the top 10). Yet, the Mets’ path to Bourn still might not be clear.