They asked Hoyer if there were any "don't-sleep-on" guys. He mentioned Holder, who had just pitched the previous inning. The only other guy he mentioned was Kohl Stewart, who he said has looked really good in his bullpens.
As a former high first-rounder, I'd have thought Steward might be a big-arm guy. But per his fangraphs stats from 2018 and 19, he was just a pedestrian 93, no faster than any other camp body or non-roster invite.
He's had a couple of years to work on things, so it might be fun if he's got something now that he didn't before.