Luis Castillo might be a more valuable trade chip than even the Mariners expected

A vibe shift is underway on MLB's summer trade market, and the Seattle Mariners may be in a perfect position to benefit. The tell will be if they not only trade Luis Castillo, but do so in such a way that isn't simply about offloading his contract.

The concept of a Castillo trade is kind of old hat by now, but it refuses to die for a reason. Though he's not quite an albatross, his having aged out of acehood and his $24.15 million salaries through 2027 are problems for a Mariners franchise that A) has a more-than-full rotation and B) only so much spending power. And so, like the beatings on a ship with bad morale, the trade rumors have continued.

Well, now here come Ken Rosenthal and Will Sammon of The Athletic with a piece that makes the case that the potential for a Castillo trade "appears even stronger."

The 33-year-old is currently on his annual warm-weather heater, with his last eight appearances yielding a 3.03 ERA and 2.96 FIP. Meanwhile, he's part of a six-man rotation surplus on a team that has no such surpluses in its offense or bullpen.

The summer trade market is changing shape and possibly losing ace trade chips

So, there's that. And then you can add in Jerry Dipoto's tease of a wave of "buyer-to-buyer" trades in which contenders swap MLB assets. It's an ideal environment for a Castillo trade. It hypothetically means more chances for a bad contract swap, and maybe even to shed his remaining contract and recoup talent for him.

You know what could also help the Mariners' efforts to trade Castillo? Scarcity. A bunch of top-of-the-rotation types have had their names thrown out there in trade speculation, but basically all of them are fodder for a cold-water bath right now.

The Rosenthal and Sammon report downplays Sonny Gray, Michael Wacha and Seth Lugo going anywhere. The Los Angeles Angels are reportedly closing ranks around Reid Detmers and José Soriano. For their parts, Tarik Skubal, Casey Mize, Joe Ryan and Sandy Alcantara pitch for teams whose wild-card hopes are still alive. Skubal, Mize and the Detroit Tigers have taken a downright miraculous turn, going 21-12 since closing May with a 20-38 record.

Which teams could be in on Luis Castillo if the Mariners start fielding offers?

None of this is likely to convince another team that Castillo is worth the ace-caliber price the Mariners paid for him back in 2022. He's not a Game 1 starter, or even a Game 2 starter. However, all it takes is a team talking itself into the three-time All-Star as a Game 3 starter.

His prospective fits look largely the same now as they did back in May. He still makes sense for the Chicago Cubs and Atlanta Braves, each of whom has a right-handed hitter with a high salary — Seiya Suzuki for Chicago and Sean Murphy for Atlanta — who could be trade bait. A trade with the Baltimore Orioles involving Taylor Ward could be another possibility.

You can otherwise never rule the San Diego Padres out on any trade, and other starter-needy contenders include the Chicago White Sox, Toronto Blue Jays and St. Louis Cardinals.

Either way, the Mariners should be just as motivated to do a deal. Neither a six-man rotation nor a return to the piggyback is an optimal solution to their rotation surplus. And the sooner someone goes, the sooner the team can call up Kade Anderson.

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