Not every prospect pans out.
That's not to say that Lucas Giolito will fall into the category of young players who never end up doing what their prospect ranking indicated they might. But take a quick poll of White Sox fans and observers, and Giolito probably isn't starring on their team of the future, the team that finally enters contention mode at the end of this rebuilding process.
Giolito has his ugly 2018 campaign to thank for that current status, but it's a status he can change with a much better 2019.
This season will almost have to go better.