The Mariners can dream on Gunnar Henderson, but the trade math gets ugly fast.
Seattle is expected to check in on the Orioles infielder, according to Ryan Divish and Adam Jude from the GM meetings, and the appeal is obvious. Henderson gives the Mariners a real answer on the dirt, whether that means taking over at shortstop after eight years of J.P.
Crawford or sliding to third base if Colt Emerson is the long-term shortstop plan. He’s already handled third in Baltimore, and his left-handed power would play in a big way at T-Mobile Park, where a bat with 37-homer upside is exactly the kind of jolt this lineup could use.
But the pitching side of the deal is where the conversation turns sharp.
One industry source described the price as “exorbitant” and said the odds of Seattle meeting it were very low. That’s not surprising. If the Mariners are going to chase Henderson, they have to decide how much of the rotation they’re willing to sacrifice to do it.
Bryan Woo and Bryce Miller are off the table. George Kirby is the first arm we’d even listen on, and his extra years of club control should lower the prospect cost.
Logan Gilbert is a different case entirely. Without an extension, he’s one year from free agency, and the idea of moving that final season of Gilbert for two seasons of Henderson is at least a conversation worth having.
Emerson Hancock would cost Seattle fewer proven innings, which is exactly why Baltimore would likely push for a much larger prospect package. The Orioles could ask for Ryan Sloan and another top prospect bat, and that kind of ask would force the Mariners to weigh what they’re really giving up to keep the top of the rotation intact.
That’s the central problem here: Henderson can help a lineup that can look thin, but if Kirby or Gilbert is the price, Seattle has to come out of the winter with another starter it trusts against Houston in September. Otherwise the trade would just create the same old headache in a different spot.
The market for Henderson isn’t simple, either. Coby Mayo shows how hard it is for both sides to settle on a number for upside, and Henderson brings an even bigger challenge.
He hit 37 homers and posted 8.8 bWAR in 2024, then dropped to 5.4 bWAR in 2025 and 3.2 in 2026. Last season’s 24 homers still matter, but so does the 101 OPS+, which is only a tick above league average.
He’s 25, though, and there’s still time for him to get back to the version pitchers hated seeing with runners on.
There’s also a longer financial angle. Henderson can reach free agency after 2028, and the market looks very different depending on whether he’s coming off the 2024 version of himself or the 2026 version. If Seattle lands him now, Jason Kanzler and his staff would get a full season to work with him before that contract year, and his background in hitting instruction and player development could matter.
So the line is pretty clear for Seattle. Woo and Miller stay.
Gilbert is only in play without an extension. Kirby is only in play at a price that reflects his control.
If Baltimore wants Kirby plus a haul from the farm, the Mariners should walk away. Hancock is the cleaner path if they want to keep the top of the rotation together, but even that has a ceiling.
Seattle wants Henderson’s bat in a pennant race. It also needs five starters it can trust when it gets there.
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