WEST PALM BEACH, Fla. — The Astros’ six-man rotation isn’t just a pitching strategy. It’s a roster stress test.
Houston plans to open the season with six starters to navigate 26 games in 28 days. That protects arms. It also thins the bullpen. With starters likely working shorter outings early and two key relievers already managing injuries, someone will need to absorb innings without sacrificing effectiveness.
AJ Blubaugh might be the only pitcher in camp built for exactly that job.
The Ultimate Flex Arm
Blubaugh’s September audition wasn’t just impressive, it was instructive.
He threw 21 consecutive scoreless innings across nine appearances. Some were one-inning stints. Others stretched to five. He spot-started. He long-relieved. He worked in tight games and low-leverage spots.
Across 32 major league innings, he posted a 1.69 ERA with 35 strikeouts. More importantly, his performance didn’t dip when his role changed.
Most pitchers are either starters or relievers. Blubaugh looked comfortable toggling between both.
“I approach it as an opportunity,” Blubaugh said Saturday. “Whether that’s starting or relieving, it really doesn’t matter to me. Whatever role opens up to me, I’m going to take it and run with it.”
That mindset matters in this specific moment.
The Hidden Roster Gap
Hunter Brown, Cristian Javier, Tatsuya Imai and Mike Burrows appear set for four rotation spots. Lance McCullers Jr., Spencer Arrighetti, Ryan Weiss, Nate Pearson and Jason Alexander are battling for the rest.
But here’s the issue: whoever loses the rotation competition doesn’t automatically become an ideal bullpen fit.
McCullers is too valuable to park in middle relief long-term. Weiss is still adjusting to big-league hitters. Arrighetti’s workload management remains a factor. Pearson and Alexander profile more as traditional depth.
Meanwhile, Josh Hader and Enyel De Los Santos are both behind in camp due to injury concerns. The bullpen expected to protect a six-man rotation is already stretched.
Blubaugh checks multiple boxes at once:
- Can cover bulk innings if a starter exits early
- Can bridge to Bryan Abreu and the late-inning group
- Can spot-start if needed
- Has already shown he can adjust on short notice
That’s not depth. That’s structural support.
Starter Development vs. Immediate Value
At 26, Blubaugh is arguably Houston’s most MLB-ready pitching prospect. The long-term question is whether the Astros view him as a future rotation staple.
If they do, leaning on him in relief could slow that development.
But modern pitching usage isn’t binary anymore. The value of a multi-inning, role-flexible arm in a condensed schedule may outweigh the traditional starter timeline.
Blubaugh said he learned something critical during his September run:
“I learned that there’s a difference between routine and superstition. Every baseball player’s got these certain things that they feel like they need to do. And I learned a lot of different things that I didn’t need, I just wanted to do.”
That adaptability is not universal. Some pitchers need predictability. Blubaugh proved he doesn’t.
The Quiet X-Factor
Imagine a scenario where:
- Hader misses early time
- Abreu slides into the closer role
- The six-man rotation holds through May
- Starters require occasional extra rest
Who becomes the connective tissue between innings?
Not the ace. Brown’s job doesn’t change.
Not the backend starter fighting for stability.
It’s the pitcher who can handle the fourth, fifth and sixth innings on short notice. The one who keeps games close before the late-inning arms take over.
That might be Blubaugh.
If he replicates even a portion of last September across a full season in a flexible role, his impact could outpace traditional counting stats. He may not lead the team in wins or saves. But he could quietly stabilize everything around him.
Saturday, he tossed a scoreless inning in the Grapefruit League opener. Whether that outing signals a defined role or simply spring experimentation remains to be seen.
What’s clearer is this: if Houston’s six-man experiment works, AJ Blubaugh may be the reason it holds together.