If Chourio hadn't signed that contract, he wouldn't have opened the season on the roster.
And Chourio had no flaws in his game, literally the *only* concern was his age. Rodriguez has piles of questions around him:
1. Is he actually a CF?
2. Will his swing-and-miss kill him against MLB pitching?
3. Is he too passive?
You're comparing basically flawless prospects in Chourio and Mauer to a guy with real questions and real flaws. Rodriguez is a good prospect who will likely play a role on an MLB team. But whereas Mauer and Chourio's success was basically guaranteed by the time they were 20 years old, Rodriguez still has question marks around him and less than 200 PAs in the upper minors to quell those questions.