Kovar's save percentage was 58.8%. Compared to the other teams (not individuals) in the division, only Burton the same percentage, the rest are better. 8 teams above 70%, another 4 at 69%, another 3 between 65% and 68%. Looks like Kovar's rival for his Swindon place, who made two starts, had a lower save percentage 50%.
Last season there were 2 teams in League One with save percentages below Kovar's figure but only another two below 65%. 11 teams above 70%.
No advanced goal-keeping stats available that I can see on Fbref.
The lowest team (not individual) save percentage in the Championship right now is 63%, with only one other team under 65%. 11 teams above 70%.
Dean Henderson's save percentage in League One was 82.4%, then 73.5% in the Championship, and 75.2% last season in the PL.