The Diamondbacks are calling up their top prospect in their minor league system. But that means they’re dumping one of their former highly regarded farmhands. Arizona called up outfielder Ryan Waldschmidt from Triple-A, and to make room for their No. 1 prospect on MLB Pipeline, designated fellow outfielder Alek Thomas for assignment on Friday ahead of a matchup with the Mets. Less than two years after he was taken with the No. 31 pick in the 2024 MLB Draft, Waldschmidt reached the top level of the minor leagues and has thrived. Alek Thomas hits a solo home run against the San Diego Padres during the second inning of the MLB Mexico City Series on April 25, 2026. Getty Images He has a .289/.400/.477 slash line with 15 extra-base hits in 128 at-bats with Triple-A Reno. It follows a sterling 2025 season in which Waldschmidt hit 18 home runs with 78 RBIs and a .892 with in High-A and Double-A. His year-end performance got him a Double-A All-Star nod from Baseball America.…