For a time this offseason, it seemed that the Mets might be trying to construct a super-bullpen. They signed Trevor May, went down to the wire with Brad Hand, and were rumored to be in pursuit of some other top firemen. In the end, however, May and lefty Aaron Loup were the only significant names signed.
Meanwhile, the Mets were also bringing in a bunch of interesting arms with the idea of finding some gems among that group. It's not an indefensible way to construct a bullpen. Still, it's only going to work if pitching coach Jeremy Hefner and his fellow instructors could help at least a couple of these guys take the next step in their development as pitchers. That, of course, still remains to be seen. The proof will play out against real competition in April and May as the 2021 Mets bullpen comes into focus.
"He’s still so young and his abilities are special. Last year coming over to us, it's just another stepping stone in his career where he's learning. He's more mature, he's more experienced. I think he’s slowed down a little bit some of the things he needed to get better at. That's what he's doing right now in this camp."
"This changeup is a lot better. Last year, he even said it to me a couple times over the phone that he wanted to work on everything, but specifically getting lefties out more. So his changeup right now is in a good place. He threw a couple and they looked really good. So the command, along with a third pitch that he can bring with the fastball-slider mix that he usually showed last year, is what I've seen."
Now, I'm not sure that I buy the "more mature... more experienced" bit. That sounded like manager-speak to me. Castro had accumulated over 270 Major League innings before he got here. He wasn't unsuccessful, but his success was uneven. The talent was obviously there. That's why Toronto, Colorado, Baltimore, and the Mets have given him the ball since he was 20 years old.
Just looking at the stat lines, his evolution as a pitcher has been interesting. He began pitching substantial innings his first two seasons in Baltimore in 2017 and 2018. In 152.2 IP over those two years, he allowed 7.5 H/9, which is very promising, but the 5.6 K/9 would make me think that I was looking at the numbers of a soft-tosser.
Castro's strikeout number picked up to 8.7/9 in 2019. While hardly elite for a relief pitcher, that indicates some significant change in how he attacked hitters. Then last season, with both the Mets and Orioles, he had an impressive 13.9 K/9 rate, marred, of course, by too many walks. Looking at his page on BaseballReference.com after the trade was announced, I honestly didn't know what to expect.
It's going to require the kind of organization that can take a Miguel Castro and/or a Sam McWilliams and help them put it all together to be a real contributor. And/or maybe they take a Dellin Betances and/or a Jeurys Familia to recapture some of their past magic. And/or help a Jerad Eickhoff and/or an Arodys Vizcaíno get past injuries that derailed once-promising careers and become Major League contributors again.
It's fantasy to believe that all of these things will happen but, for both the upcoming season and the future of this franchise, it's crucial that one or more of these stories has a happy ending. It's how smart teams get on top and stay on top. They find the value in pieces that other teams couldn't actualize and take players they already have and help them be better. A good part of the reason that the Mets haven't known much success is simply that they haven't been very good at doing these things for many years.
When I watch a player like Miguel Castro with both interest and hope, any success that player enjoys makes it easier for me to see the Mets building something really great for the future. After decades of mediocrity and worse, that's something that I could really get behind.
Please stay safe, be well, and take care.