It's ironic that he was part of the Polanco trade because the first thing that came to my mind was the Polanco call-up in 2014. Polanco was at High-A but he was on a the 40-man. The Twins had a roster crunch and needed a warm body, so they called up Polanco.
This is a little different, of course, because Gonzalez is at AAA, but it feels more like a "warm body" situation than a "this dude is ready for his first taste in the majors" situation.