Early in the offseason, it looked as though there was a good chance the Mariners would move one of their two candidates for the fifth spot in the rotation. The quartet of Luis Castillo, Robbie Ray, Logan Gilbert and George Kirby create a standout set of options in slots one through four, and Seattle has a pair of solid back-of-the-rotation options in Marco Gonzales and Chris Flexen. Behind that duo, prospects like Emerson Hancock, Bryce Miller and Taylor Dollard have all reached Double-A and enjoyed success there, placing them within reasonable proximity of MLB readiness. Miller, in particular, cracked the back of some top-100 lists this year, landing 74th on Kiley McDaniel’s list at ESPN, 98th at MLB.com and 100th at Baseball America.

It’s a strong collection of depth, and the presence of Miller, Hancock and Dollard seemed like it could be enough to sway the Mariners to move one of Flexen or Gonzales. Flexen, as a free agent next offseason* with a palatable $8MM salary — compared to the $18.5MM still owed to Gonzales through 2024 — seemed to be the likeliest candidate. That’s true not only from an on-paper standpoint, but also when considering that president of baseball operations Jerry Dipoto plainly acknowledged in November that he’d been receiving trade interest in Flexen at the annual general managers’ meetings.

(*=There seems to be some continued confusion regarding this, as Flexen won’t have six years of Major League service time after the season, but MLBTR has confirmed that he will become a free agent next winter, as is the case with the vast majority of KBO/NPB signees whose free agent contracts expire.)

The Mariners, however, were never going to give Flexen away just to shed his salary, and the fact that he remains with the club is a clear indicator that another club has yet to put forth an offer Dipoto & Co. felt was commensurate with Flexen’s value. The extent of that value is subjective, but Flexen would be a clear upgrade to the back of several teams’ rotations.

Since returning from a successful one-year stint in the Korea Baseball Organization, he’s pitched to a 3.66 ERA in 317 2/3 innings. Granted, his 92.4 mph average fastball and 16.5% strikeout rate are below average, but Flexen also has sharp command (6.8% walk rate). He keeps lefties in check with the help of an above-average changeup and has generally done a good job keeping the ball in the yard since his MLB return. Flexen has benefited slightly from a pitcher-friendly home environment, but his numbers away from T-Mobile Park (3.75 ERA, 1.12 HR/9) are only slightly worse than those compiled when pitching at home in Seattle (3.57 ERA, 0.91 HR/9).

Because Flexen’s numbers were superior to those of Gonzales across the board, some argued that Gonzales should be the odd man out, despite his relatively lengthy tenure with the club. Gonzales is nearly three years older, however, has more than double the money remaining on his contract. Flexen’s trade value was and is higher, and while he alone wouldn’t have fetched a substantial upgrade to the Seattle lineup, he could certainly have been included in a package that worked toward that endgame.

Now, however, the majority of the teams around the game have exhausted the bulk of their offseason budget and filled the rotation vacancies that existed early in the winter. That ostensibly points toward both Flexen and Gonzales beginning the year with Seattle, perhaps with one in a long relief role. It’s always possible that a spring injury elsewhere on the staff would necessitate a scenario wherein both Flexen and Gonzales are part of the Opening Day rotation.

That said, the injury component still looms as a possibility for other clubs. Even teams that right now believe their rotations to be full could run into trouble over the next 50 days. Nary a spring training goes by without multiple pitchers going down to major injury; situations like the one that popped up today in Milwaukee — where Aaron Ashby is being slowed by shoulder fatigue — are commonplace this time of year. As the exhibition season wears on, more severe injuries that threaten long chunks (or the entirety) of an established pitcher’s season will arise. Many teams are in positions like the Mariners, where they have the depth to withstand such a hit. Others, however, are already looking at questionable depth beyond their top few names (e.g. White Sox, Blue Jays, Padres — to varying extents).

Injuries are an inevitability this time of year, and the Mariners’ depth will likely be attractive to other clubs as health troubles throughout the league arise. Seattle may prefer to stockpile that depth, but moving Flexen would likely free up some resources to expand the budget for in-season acquisitions. It’s also possible that they take on some salary to address another need on the big league roster by way of the Flexen trade itself.

For what it’s worth, Corey Brock of The Athletic speculated in his latest mailbag that the Mariners will ultimately find a deal for Flexen during spring training when an injury on another club creates a need, though it’s just as possible that said injury occurs on Seattle’s staff and takes Flexen out of the trade equation entirely.

Let’s put this one up to a vote for MLBTR readers to weigh in (link to poll)…