You are listing weights, and not names. Those front 7s at ND put a lot of guys into the NFL and multiple All Pros and Pro Bowlers. All three starting DL played in the NFL, and two others in the two deep did too.
Talent is the issue, not size.
The following players were on that two deep in the front 7 who went on to play in the NFL:
Tuitt
Nix
Day
Moore
Teo
Shembo
Williams
Okwara
And Lynch who transferred.
That’s eight dudes on the front 7 two deep who played in the NFL off of one team. The back end had three DBs (Farley, Shumate and Russell) who also played in the NFL, and Slaughter on a NFL practice squad.
That’s 11 dudes in the defensive two deep who played in the NFL & one more on a practice squad, from one team. That’s what Diaco was working with...