Golden Boy already know that it's indeed time for Garcia to face boxer that is near his prowess/caliber, Javier Fortuna was his last test to make sure if Garcia is already fit to fight heavy names and it turns out that Garcia can do it because he defeated Fortuna with a good outcome and no signs of struggles. Although Tank Davis is a different story because he is an experienced boxer who defeated big names in industry unlike Garcia, but the latter have the chance because he have a good KO power.
It's rare to have a boxer like Garcia who has both the charisma and skills to be a champion, that's why they are carefully giving him some fights that are not really that interesting because of his poor opponents. But this is just their way to make him strong and when the time they finally let them fight against a boxer like Tank Davis, he already learned a lot and has a higher chance to defeat him because already has enough pre-fights to face strong opponents.