The last one or two spots in a major league bullpen are typically fungible. Due to injuries and ineffectiveness, a team will often have to churn through several options to fill those spots throughout the season. Typically, the players on the edge of the roster will bounce between the minors and majors, and when they are on the big-league team, they aren’t generally used in high-leverage spots.
Luis Ortiz served in that role for the Phillies in 2023. The former top 100 prospect was selected off waivers at the tail end of the 2022 season and made a solid accounting of himself in Spring Training.