Bryce Miller's rehab plan clarifies timeline for Mariners' 1st hard choice of 2026

The Mariners haven't needed Bryce Miller to put up the fourth-best ERA in the league so far, so they should count their blessings. Yet the time has come for them to also be counting days, as it won't be long before the team is face-to-face with the dreaded six-man rotation question.

Because of inflammation in his left oblique, Miller hasn't pitched since his spring training debut on February 26. After so many good days and bad days since then, he purportedly felt great in a bullpen session last Saturday in which his fastball was sitting 98-99 mph.

He's now ready to begin a rehab assignment for Triple-A Tacoma, with general manager Justin Hollander telling Ryan Divish of The Seattle Times and other media members that Miller will need "a full 30 days to build up."

The problem, of course, is that the Mariners already have a functional rotation even without Miller.

Emerson Hancock's rise should convince Mariners he must stay in the starting rotation

That has a lot to do with the rise of Emerson Hancock, whose 0.7 rWAR leads the pitching staff. And given that his breakout status is supported by impressive metrics such as a 2.79 xERA, it would be malpractice for the Mariners to simply stash him in Tacoma once Miller is ready.

As he has a 5.40 ERA through four starts, could Luis Castillo be the odd man out? Not if you ask MLB.com's Daniel Kramer, who wrote that the veteran right-hander getting bumped from the rotation is "just not going to happen."

Logan Gilbert, George Kirby and Bryan Woo obviously aren't going anywhere either, so the possibility of a six-man rotation simply can't be avoided.

The main drawback is obvious, as a six-man rotation means fewer outings for everyone. That's sub-optimal with a rotation with this much talent, and then you get into potential disruptions to routines and the potential consequences. "If it ain't broke, don't fix it," as they say.

But if anyone's being honest, Castillo working less would have the potential to be a net positive. And then you just have the obvious benefit of less injury exposure for everyone. After Gilbert, Kirby, Woo and Miller all spent time on the IL last year, that should have strong appeal to the Mariners — especially if the ultimate tradeoff is healthier, stronger starters for October.

Granted, what we're doing here is blatantly putting the cart before the horse. Miller still needs to hold up as he gets his arm back into shape. And even if that goes well, the probability for more pitching injuries is never zero percent. This "problem" may well sort itself out in the next 30 days.

But if the Mariners do find themselves with six healthy starters 30 days from now, one won't envy the choice they'll have to make.

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