ESPN.com's Jayson Stark, who's usually fairly plugged-in to various executives in the baseball business, sent out this tweet Thursday afternoon:
Other clubs say #Cubs aggressively trying to include Starlin Castro in any deal. It was interesting that Addison Russell played SS yesterday
— Jayson Stark (@jaysonst) July 30, 2015
I don't think it's that interesting that Russell played shortstop yesterday; Castro was due for a "breather" day. And since this is officially silly season as well as trade season, you might want to temper any expectations of Castro being dealt:
There are reports #Cubs are aggressively trying to move Castro.