The LA Angels believe in Tyler Skaggs, and have his entire career. They originally drafted him in the first round in 2009, and even after trading him to the Arizona Diamondbacks, they dealt to reacquire him in 2013.
At the time, Skaggs has a career era of 5.43 in the MLB. However, since heading back to Anaheim, he has gotten better each and every year. And 2019 could be the year Skaggs turns into the ace the Angels drafted him to be a decade ago.
You might ask how a pitcher who has never finished a season with an ERA below four or pitched more than 126 innings in a season might become an ace for a playoff contending team.