This staff has actually done a great job added more size inside through recruiting, those guys are just young and still developing (or not even on campus yet).
List of guys recruited and signed by Mario since he arrived (not including transfers)
DT
Ahmad Moten 6-3 325 RSO
DT
Josh Horton 6-4 295 RFR
DT
Armondo Blount 6-2 310 FR
DT
Justin Scott 6-4 310 FR
DT
Artavius Jones 6-3 280 FR
Average 6-3 304
Now compare that to Michigans DT's during that same time
DT Mason Graham 6-3 318 JR
DT Kenneth Grant 6-3 339 JR
DT Alessandro Lorenzetti 6-5 301 JR
DT Brooks Bahr 6-5 298 SO
DT Cameron Brandt 6-4 277 SO
DT Trey Pierce 6-2 300 SO
Average 6-3 305