Bold headline first: The Marlins are reshaping their bullpen by shipping a lefty to Seattle, banking on fresh depth over the next season. But here’s where it gets interesting: this is more than a simple move – it signals Miami’s strategy to retool the roster around dependable arms while giving young pitchers a clear path to development.
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The Miami Marlins have been active this offseason with multiple notable free-agent signings and trades, and they’ve just added another transaction to the mix.
This time, their latest deal sends left-handed pitcher Josh Simpson to the Seattle Mariners in return for cash considerations. Last week, Miami designated Simpson for assignment, clearing space on the 40-man roster to facilitate the acquisition of left-hander John King.
Today the Marlins announced they had received cash considerations from the Mariners in exchange for LHP Josh Simpson.
Simpson now heads to the Pacific Northwest with the goal of earning a steady spot in the Major Leagues.
Impact on Miami:
Losing Simpson isn’t the most seismic move in a busy offseason for the Marlins, but they are parting with a left-hander who still has potential. His 2024 season was hampered by injuries, and 2025 marked his pro debut in June. The start of his MLB journey wasn’t flawless, but with continued development, he could evolve into a valuable reliever.
Across 31 appearances in 2025, Simpson posted a 7.34 ERA with 36 strikeouts over 30.2 innings. Consistency wasn’t his hallmark, yet Seattle seems to view him as a longer-term bullpen piece with upside.
For Miami, the trade frees up room and brings in John King, a 31-year-old whom they acquired from the St. Louis Cardinals last season. King pitched 48.1 innings across 51 games, logging a 4.66 ERA and 28 strikeouts. He’s a left-handed option known for reliability and steadier performance, which aligns with Miami’s aim to strengthen bullpen depth.
In the bigger picture, the Marlins’ pitching staff struggled at times last year, so adding a left-hander with a track record of consistency is a meaningful upgrade for the bullpen. Their rotation and bullpen are trending toward greater depth, a trend they’ve been pursuing in recent weeks.
Bottom line: the Marlins didn’t part with a marquee ace, but if Simpson flourishes with Seattle, Miami fans may wish he’d stayed a bit longer. In the meantime, Miami is positioning itself for a postseason push in 2026. The signings of Pete Fairbanks and Owen Caissie are expected to supply immediate impact and long-term depth, though the team isn’t necessarily done making moves before Spring Training.
Spring training starts soon, and Miami will be looking to finalize rosters and fine-tune their relief corps as they head toward the regular season.
Controversy and reader prompts:
- Some may argue that trading a developing left-hander for cash is a short-sighted move that could come back to bite them if Simpson breaks out elsewhere. Do you think the Marlins should have kept him for developmental time, or is cash today a smarter risk?
- Another debated point is the value of left-handed bullpen depth versus acquiring impact arms. Which strategy do you prefer for a team aiming for the postseason: investing in a proven bullpen arm now or developing potential relievers through the system?
- How would you evaluate this offseason in total for the Marlins – a strong step forward, or a series of middling moves that leave questions unanswered? Share your take in the comments.
