Well, no.
The Pirates were in the mildly unusual position of having their 2019 rotation locked down before the 2018 season ended. Barring trade or injury, it’ll be Jameson Taillon, Trevor Williams, Chris Archer, Joe Musgrove and Ivan Nova. When you ask yourself, though, what happens if, say, Musgrove (who just had abdominal surgery) isn’t able to open the season again, it gets awfully shaky.
The Pirates have a bunch of prospects who looked like they could be rotation pieces, but who just haven’t transitioned well to the majors. Right now, the sixth starter would probably be Nick Kingham.