Ken Rosenthal just dropped an inevitable Mariners trade take (and he's right)

You don't need to tell us that the Seattle Mariners have a starting pitching surplus, or that this alone could get trade talks going. But since not many MLB reporters as plugged-in as he is, it hits different when Ken Rosenthal of The Athletic starts beating the same drum.

Rosenthal laid it all out in his latest news and notes column, expressing the usual lip service about the club's plans for a six-man rotation and piggyback starters, as well as potential injuries. Then he drops this line: "But if the Mariners are reasonably healthy at the deadline, they could entertain trading a starter."

There's history here, of course. The Mariners being reluctant to trade from their rotation has been a thing under Jerry Dipoto, and you can understand why. The rotation is the organization's baby, and one consisting of all homegrown pitchers apart from Luis Castillo. Apart from that, pitching surpluses are fragile as a general rule.

Yet even in the wake of Cal Raleigh's first-ever IL stint, this is still a World Series or bust year for the Mariners. Such years require boldness, and trading a starter wouldn't even be that bold.

The Mariners have multiple starters they could deal, but only one obvious pick

It's obviously hard to imagine Logan Gilbert, George Kirby or Bryan Woo going anywhere. It's otherwise been a breakout year for Emerson Hancock, and Bryce Miller looked better than ever in his return from oblique inflammation on Wednesday. There's also Kade Anderson, who feels untouchable amid his rapid rise in the minors.

That's a healthy selection of nuclear options, which likely means any trade conversations the Mariners end up having are going to be centered around Luis Castillo.

This, too, is something Rosenthal got into, and perhaps it feels a little more awkward after "La Piedra" came through with a start the Mariners absolutely needed to have on Thursday. Even in that one, though, watching him pitch was still akin to having a panic attack. He's gotten into 91 three-ball counts, 33 more than any other Mariners pitcher.

Even knowing Castillo is the Mariners' highest-paid player via $24.15 million salaries for 2026 and 2027, there are still hypothetical fits for him out there. The rotations of the Chicago Cubs and Toronto Blue Jays have been decimated by injuries, and both clubs have lots of money. The Baltimore Orioles and San Diego Padres aren't as well off, but they also need starting pitching.

In an ideal world, the Mariners would swap Castillo for an impact hitter who could pick up some slack for an offense that isn't living up to expectations. This hitter would preferably hit right-handed and play third base. So if the San Francisco Giants are willing to talk, maybe Matt Chapman could once again be of interest to Seattle.

Those last two paragraphs? Yeah, that's what they call "just spitballing," But if even Rosenthal is tip-toeing into waters in which the Mariners actually trade a starter, that part of this scenario might no longer be far-fetched.

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