Shawn Armstrong
Although trading away former top prospect Dylan Carlson for a rental reliever might seem costly, the deal appears beneficial for all parties involved.
For Carlson, this trade offers a new beginning with an organization known for maximizing player potential.
Meanwhile, Shawn Armstrong and the Cardinals benefit as well. Armstrong, a veteran right-hander, gets a chance to rebuild his value on a postseason-contending team before entering free agency. Despite a high 5.40 ERA upon arriving in St. Louis, Armstrong's performance was somewhat better than that figure suggests.
With the Tampa Bay Rays in 2024, Armstrong struck out 23.4% of batters, maintained an 8.9% walk rate, and kept home runs under one per inning. Advanced metrics like FIP (3.77), xFIP (4.21), and SIERA (3.89) show a more favorable view of his skills than traditional stats might indicate.
Now part of the Cardinals’ bullpen, Armstrong's challenge is to prevent runs more effectively. While his strikeout, walk, and home run rates are solid, the quality of contact he's allowed indicates a need for improvement, with metrics like barrel percentage, hard-hit rate, xERA, xBA, xSLG, and average exit velocity placing him in the lower 31st percentile.
Transitioning to a new league and division could be advantageous as he faces NL Central batters.
Armstrong won't be immediately placed in high-leverage situations, given that the Cardinals' bullpen ranks seventh in ERA and fifth in FanGraphs' Clutch rating. However, if he can mitigate some of the damage he's been prone to, he could significantly bolster an already strong bullpen.
Overall, the Cardinals’ trade deadline actions should be viewed positively. They filled a gap in their starting rotation, added a bat proficient against left-handers, and strengthened their bullpen. Yet, considering the competition for the 2024 postseason, it seems that St. Louis might have needed to make even more substantial moves to surpass teams like the Milwaukee Brewers or a combination of the Atlanta Braves, Arizona Diamondbacks, and San Diego Padres.
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