Walker, Gregg was fired when MLB purged the umpires the year they threatened to walk out, or walked out. I really can’t remember. He was one of the few who was not rehired. It is believed that a great deal due to his calls in that game. He was also consistently voted one of the worst umpires in the league. That game was certainly his opus, but he was a crap ump before that display.
However his batting averages are pretty high meaning when he makes contact they turn into hits. Maybe Greg Walker can teach him plate discipline. I would say this is a solid trade with nothing to lose. Hoover was solid but going nowhere in our system.