Yes, Carroll's prior defenses were built in generally the same way. Freakish athleticism at FS (Troy Polamalu, who technically played SS, Jason Leach, and Taylor Mays all ran 4.3 40s), power hitting at SS (Kevin Ellison was known to be a hard hitter at 230 lbs, and so were Darnell Bing and T.J. McDonald), and tall corners (Terrell Thomas, Josh Pinkard, Kevin Thomas, Cary Harris, etc. all 6'1 or taller) were staples of Carroll's defenses at Southern Cal. I don't know if they were necessarily built from the back up. It might have been a coincidence that he hit on certain positions earlier in the process, while his rushers had to be added in free agency (Cliff Avril and Michael Bennett).
Carroll's LBs at USC were probably so impressive (Lofa Tatupu, Keith Rivers, Brian Cushing, Clay Matthews, Ray Maualuga, Malcolm Smith, etc.) because they were being recruited and developed by Ken Norton, Jr.