Robert Stephenson is a red flag for me.
The Pittsburgh Pirates added Stephenson off waivers at the end of August 2022. The right-hander leaned on his slider more often at the end of that season, generating strong enough results for the Pirates to bring him back. That same slider in April 2023 wasn’t as effective, going up against early-season minds and the best lineups from each team at the outset. Under the Pirates, Stephenson eventually threw his fastball more often, countering the slider issues with a worse pitch. He was eventually traded to the Rays for Alika Williams.