The Houston Astros bullpen right now has three guys who have been used as major league starters this season and four guys who came through the minor leagues as starters in Francisco Liriano, Francis Martes, Joe Musgrove and Chris Devenski. Not to mention that when Lance McCullers Jr. returns that means Brad Peacock (or potentially Mike Fiers) would be another starter added to the bullpen bringing the total to five guys who would be considered long relievers in most bullpens.
Last season the Astros had brief success with a trio of starters turned long relievers as Michael Feliz and Scott Feldman were doing a great job alongside Devenski out of the bullpen.