Keep in mind that players ranked past No. 224 are the equivalent of an undrafted free agent.
Foskey was 211, the equivalent of a 7th round pick.
Elston has also had no busts.
Contrast that with production from the back end of the defense: Houston Griffith was ranked 70th overall, but won't be drafted. Shayne Simon ranked 90th and won't be drafted. Jack Lamb was ranked 99th and won't be drafted. Derrick Allen was 106 and won't be drafted. Litchfield Ajavon was ranked 230 and never played a snap. Isaiah Rutherford was ranked 208 and was a bust.
There's no doubt that Elston has been the best developer of talent on the defensive staff and this 5 year run was absolutely the result of great defense, and mostly DL play. The offense has been average at best.