Iowa Cubs Detail Shortstop Candidates, 2025 Defense, Likely Opening Starter

James Triantos is slated to return to Triple-A Iowa, a placement MLB framed as sending "Triantos headed back to Triple‑A Iowa's loaded lineup with a reputation for having exceptional bat-to-ball skills, above-average speed and questionable power." That assignment reshuffles a shortstop picture the Iowa Cubs put under the microscope in a Feb. 24 position-preview installment as the Triple-A season approaches in late March.

MLB's scouting note on Triantos underlines the offensive trade-offs the Cubs will weigh in Des Moines. The prospect's bat-to-ball skill and speed are clear strengths, but MLB flagged that "the power continues to be below average" and that Triantos' chase rate "ranks below the fifth percentile for Triple‑A." MLB also observed that "Triantos was always pretty aggressive, but he's become worryingly so to this point in '25," a red flag for an academy that will expect contact and plate control at Triple-A.

Kevin Alcántara complicates that picture from the organizational side. Northsidebaseball noted Alcántara "performed at the highest level in 2025, albeit in the minor leagues" and projects "decent power, 10-15 steal potential, and athleticism to hold down any of the three spots." Northside also reported Alcántara is on the Cubs' 40-man roster and argued "the assumption should be for Alcántara to start the year back in Iowa until a consistent spot at which to play opens up," barring Moisés Ballesteros not being ready or DH roles shifting.

Ballesteros has a case to displace a 40-man option. Bleedcubbieblue graded Ballesteros B+ and cited his small-sample success: "In three different stints with the Cubs he batted .298/.394/.474 (17‑for‑57) with two doubles, a triple (!), two home runs, 11 RBI and nine walks." That 17-for-57 line is the clearest offensive argument for a Triple-A everyday role and is the specific reason Northside flagged Alcántara's likely Iowa start as conditional.

The rest of the internal competition mixes veteran depth and prospect projection. Bleedcubbieblue highlighted Matt Shaw's 2025 struggles from Opening Day to the All-Star break: 63 games, .198/.276/.280, two home runs and 45 strikeouts, and noted Shaw spent a month at Triple-A Iowa during that stretch. Willi Castro's time as a Cub produced a .170/.245/.240 slash line in one of the samples Bleedcubbieblue published, earning a grade of F and the assessment that "he’s a free agent and won’t be back."

Scouting reports shape defensive expectations for 2025 form in Des Moines. Justbaseball described Mitchell as "rather rangy with quality jumps to his left and right" and projected he "should get reps at shortstop once he transitions to the next level." Justbaseball also said Kilen's swing rate is now under 40 percent with a chase rate below 20 percent after adjustments and that he "has the chops to handle shortstop long-term" despite being "blocked currently by Dean Curley." Holliday showed triple-digit exit velocities, including a 111 MPH bolt during 18U trials, and scouts placed a 70 on his arm this spring, suggesting corner-versus-short decisions will factor into roster construction.

Catching and bench dynamics will influence shortstop choices by downstream moves. Bleedcubbieblue cataloged Miguel Amaya's injury-plagued 2025: 28 games played, three months lost to an oblique injury, then an ankle sprain in the first game after returning in Toronto, and the outlet concluded "He should be 100 percent for 2026" and projected he and Kelly to form "an excellent catching tandem." Northside tracked roster posture for the big-league club, noting Alcántara and Justin Dean are on the 40-man while Dylan Carlson and Chas McCormick are non-roster invitees and that "On Monday, the Cubs added Michael Conforto to that latter group." Northside also pointed to Conforto's 23.2 percent chase rate (82nd percentile) and 84th percentile walk rate, tempered by a falling barrel and hard-hit rate and a .247 BABIP.

Practical roster resolution will come in March. MLB's placement of Triantos in Triple-A gives Iowa an immediate top-line candidate, while Northside's projection that Alcántara "should start the year back in Iowa" makes the Des Moines shortstop opening contingent on Ballesteros' readiness and how the Cubs use their 40-man and non-roster invitees. Between Triantos' assignment, Ballesteros' 17-for-57 heater, and Alcántara's 40-man status, the opening-day shortstop picture in Des Moines will be decided by a mix of small-sample performance, roster flexibility and the Cubs' evaluation of plate discipline versus contact ability.