In a season by a DT since 1998 according to Pro Football Reference:
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Again, look how they are counting .. . Donald has 7 sacks, they show 7.5. They show 10 tackles, but Stats, LLC shows 9. This is because Donald has 8 solo tackles for loss and 2 where another player shared in the tackle for loss (stuff). So, it's a different accounting method.
In this case, since they are doing it the same for all players, it makes no difference. By any standard or accounting method Donald is doing extremely well.
Others of note, prior to 1998
1984 Dan Hampton 9 and 11.5 sacks for 20.5
1985 Klecko 8.5 amd 7.5 for 16
1987 HenryThomas 12 and 2.5 for 14.5
1988 Henry Thomas 11 and 6 for 17
1988 Jerome Brown 9 and 5 for 14
1989 Jerome Brown 17 and 10.5 for 27.5
1989 Jerry Ball 14 and 9 sacks for 23
1989 Michael Dean Perry 7 and 11.5 for 18.5
1989 Keith Millard 11 and 21 for 32
1990 Michael Dean Perry 12 and 11.5 for 23.5
1990 Ray Childress 11 and 8 for 19
1991 Michael Dean Perry 11 and 8.5 for 19.5
1991 Henry Thomas 11 and 8 for 19
1991 Jerome Brown 9 and 9 for 18
1992 Cortez Kennedy 12.5 and 14.5 for 26.5
1992 Henry Thomas 9 and 6 for 15
1992 Michael Dean Perry 9 and 6 for 15
1992 Ray Childress 6.5 and 13 for 19.5
1993 Chestger McGlockton 15 and 7 for 22
1993 Michael Dean Perry 14 and 6 for 20
1994 Eric Swann 11.5 and 7 for 18.5
1995 D'Marco Farr 11 and 11.5 for 22.5
1995 Chester McGlockton 11 and 7.5 for 18.5
1995 eric Swann 8 and 8.5 for 16.5
1996 Sapp 9 and 7.5 for 16.5
1997 Jim Flanigan 13 and 6 for 19
1997 Bill Johnson, Rams 15 and 4 for 19
1998 LeRoi Glove 10 and 12.5 for 22.5
Not complete, . .but these are some other good examples of players making plays behind LOS from DT spot.