Statistically, Allsop isn't much worse than other keepers we've had in the Championship recently, so not sure he'd be the worst keeper we've ever had.
This season he's played 32 games, kept 8 clean sheets, and conceded a goal every 72 minutes, on average.
In 22/23, Ingram played 22 games, kept 8 clean sheets, and conceded a goal every 76 minutes, on average.
In 21/22, Ingram played 29 games, kept 9 clean sheets, and conceded a goal every 76 minutes, on average.
In 19/20, George Long played 45 games, kept 7 clean sheets, and conceded a goal every 47 minutes, on average.
In 18/19, David Marshall played 43 games, kept 11 clean sheets, and conceded a goal every 64 minutes, on average.
In 17/18, McGregor played 44 games, kept 12 clean sheets, and conceded a goal every 64 minutes.