The Tampa Bay Rays traded Chris Archer for pitcher Tyler Glasnow (and two other prospects).
The Rays have then "started" Glasnow in four games, for 3.0, 4.0, 5.0, and 6.2 innings, respectively. He is regarded as a powerful hurler with a good strikeout rate, but more of a long reliever than a true starter. Yet the Rays have used him in a "hybrid" role, with the hope of eventually developing a starter. In two of these games, other starters, Jake Faria, and Ryan Yarborough "relieved" Glasnow, and picked upt the wins.
The Pirates actually had three potential starters of this type: Glasnow, Chad Kuhl (now injured), and Steve Brault? Why not have a "fifth starter by committee" e.g. have Glasnow, Kuhl and Brault start on the 5th, 10th, and 15th day of a cycle, with the other two as backups during those games?
The Pirates are actually fairly good at turning long relievers into starters. Jos Musgrove, acquired in exchange from the Astros for Gerrit Cole is a case in point, and in an earlier era, James McDonald. But for whatever reason, they did not do so with Glasnow using a "piecemeal" approach, and the Tampa Bay Rays did.
What might Tampa Bay do this, not others, including the Pittsburgh Pirates?