Obvious landing spot for Mariners' Luis Castillo is officially open for business

Concerning MLB teams with too much starting pitching, the Seattle Mariners are basically a party of one. Their Wario is the Chicago Cubs, whose rotation has been so thoroughly destroyed by injuries that they're already taking on cast-offs from the last-place New York Mets.

Hmmm, smells like there's a deal to be made here. Specifically, one involving Luis Castillo.

After all, one assumes the Cubs won't stop shopping for starters just because they're the proud new owners of David Peterson. Apart from him, their depth chart at RosterResource shows three healthy starters and six on the injured list.

“The conversations are certainly happening. You talk to teams about pitching. Usually, at this time of year, (talks) are still on the smaller side of those transactions,” Cubs president of baseball operations Jed Hoyer said in a recent radio interview.

Under the circumstances, that "usually" would seem to be doing some heavy lifting. And now that the Peterson domino has fallen, maybe now's the time for Hoyer to get more aggressive?

If so, it isn't hard to connect the dots to Castillo. Per Adam Jude of The Seattle Times, he's the one member of Seattle's modified six-man rotation who might be available. He also noted in a more recent report that the Mariners and Cubs have discussed "scenarios" involving the three-time All-Star in the past.

In the abstract, Castillo's 33 years, $24.15 million salaries for 2026 and 2027 and 5.22 ERA through his first 70.2 innings of this season are turn-offs. But for the Cubs, perhaps less so. Beyond their obvious need for healthy starters, they're richer in cash than they are in expendable prospects. Their farm system is generally considered one of the weakest in MLB.

There are a number of ways the Mariners and Cubs could make a Luis Castillo trade work

The Cubs also have options if they favor a bad-contract-swap trade, including Seiya Suzuki.

By way of a 121 OPS+ and 2.3 rWAR, he's certainly a more valuable piece than Castillo if put side-by-side. He's also making less money with a $19 million salary. But there are ways around that imbalance, whether it were to involve Seattle throwing in money, prospects or both.

Another option would be to play for Matt Shaw, who's fallen into an uncertain role since debuting with the Cubs as a top prospect in 2025. As far as the Mariners are concerned, he's a guy who can hit lefties (.816 OPS) and play a good third base. The former is an obvious need, while the latter is something of time bomb. Brendan Donovan was bad at third base when he was healthy, and J.P. Crawford hasn't looked comfortable there since his move off shortstop.

No matter the preferred solution, the Mariners are in no more of a position to do nothing than the Cubs are. The piggyback strategy is not a sustainable solution for the current rotation. When Kade Anderson inevitably arrives, even less so.

Clearly, either the Mariners or the Cubs need to make the first move and tell the other, "Help us help you." They both stand to be better for it.

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