Justin Madubuike was drafted in the third round. Chris Jones was drafted in the second. Javon Hargrave was drafted in the third.
Players are available throughout the draft. Even good players. You just have to have good scouts.
That's 3 guys drafted between 2016 and 2020, and Justin Madubuike is nowhere near the same league as the other 2. He's Zach Allen apart from last season.
And Chris Jones was the 36th pick so really pushing the later rounds narrative there.
The hit rate to bust rate is probably higher at DT than any other position.
Fox Sports Top 10 DTs are,
Aaron Donald #13
Chris Jones #36
Quinnen Williams #3
Javon Hargrave #89
Jeffery Simmons #19
Dexter Lawrence #17
Cam Heyward #31
Christian Wilkins #13
Jon Allen #17
Vita Vea #12
If you want to extend it and add those from PFN not listed here you can add
DeForest Buckner #7
Kenny Clark #27
DJ Reader #166
Daron Payne #13
Derrick Brown #7
Dalvin Tomlinson #55
Leonard Williams #6
Ed Oliver #9
It's extremely rare to get a top DT that isn't a top 40 pick.
If you want to go later your ceiling is guys like Grover Stewart, David Onyemata or Justin Madubuike. If you want to wait 3 years for a Justin Madubuike to take off then fair enough, I'd rather go higher for DT's personally.
It's certainly nothing to do with scouts. Otherwise everyone has bad scouts.