The blockbuster trade between the Mets and Cubs on deadline day was almost even bigger, as The Athletic’s Ken Rosenthal writes that Kris Bryant was also part of talks between the two clubs. The actual trade saw Javier Baez and Trevor Williams go to New York in exchange for top prospect Pete Crow-Armstrong, but Rosenthal reports that the larger version of the swap would’ve also seen the Mets land Bryant and another player off of Chicago’s big league roster. In exchange, the Cubs would have received not only Crow-Armstrong, but also “a prospect they regarded even more highly and a major leaguer under multi-year club control.”
However, the Mets learned of Jacob deGrom’s injury setback on deadline day, which likely made the team wary of making too big of an all-in move. Given how the Cubs were very busy in reshaping their team at the deadline, it’s possible the mystery player could have been any of the players instead dealt elsewhere (i.e. Craig Kimbrel, Jake Marisnick) or possibly someone who is still in a Cubs uniform today. It’s probably safe to guess that one of Francisco Alvarez, Brett Baty, Ronny Mauricio, Matthew Allan, or J.T. Ginn was the blue-chip Mets prospect in question, unless the Cubs were intrigued by someone outside of the upper tier of New York’s prospect rankings.