Where did it go wrong for Edwards? In numbers...
The Hatters have conceded 44 goals in the Championship - only bottom-of-the-table Plymouth have let in more.
During their 2022-23 promotion campaign, opposition teams only managed an average of 10.7 shots per game against them (not including play-off fixtures) - that total is 13.7 this season, suggesting that the pressing game has been less effective.
And they have conceded 34 goals from open play this term, compared to 24 in the the entire campaign when they were last in the Championship.
There have also been problems at the top end of the pitch where they have scored 27 goals in 26 games, the fifth lowest total in the division.
Captain Carlton Morris scored 20 times in 44 league appearances in 2022-23, a ratio of a goal every 2.2 games, but it is 3.2 this term for his seven in 23.
And although striker partner Elijah Adebayo's ratio is better than two seasons ago, 5.2 compared to 6.0, he has only found the net five times in 26 matches.
Luton's average shots on target per game is almost identical, 3.7 compared to 3.8 in 2022-23, but the goals per game rate has fallen from 1.2 to 1.04.