DC Matt Eberflus 4-3 Defense AI Overview

[Majic]

Couple things

*** HIS version of the system worked fine for the Colts

Inheriting a defense that finished No. 30 in the NFL in both scoring defense (25.2 points allowed per game) and total defense (367.1 yards allowed per game) in 2017, Eberflus turned the defense around in just one season, to rank No. 10 in scoring defense (21.5 points allowed per game) and No. 11 in total defense (339.4 yards allowed per game) in 2018.

Eberflus's cultural impact and expertise in player development was put on display throughout the 2018 season, achieving the team's defensive heights without preeminent talent. The team's previous coaching staff advocated for cutting linebacker Anthony Walker before the year, but the front office resisted and he was retained.[11] Under Eberflus, Walker became the team's second-leading tackler with 105 on the season (53 solo). Rookie Shaquille Leonard, a 2nd round pick out of South Carolina State, led the NFL with 163 tackles (93 solo), earning First Team All-Pro Honors and making the All-Rookie Team. Eberflus's improved the Colts rushing defense from No. 26 in 2017 (120.4 rushing yards allowed per game) to No. 8 in 2018 (101.6 rushing yards allowed per game). The Colts rushing defense allowed just 3.6 yards per carry, good for 6th in the NFL, and did not allow a single 100-yard rusher all season.[12]

Eberflus also improved the Colts' passing defense from No. 28 in 2017 (246.6 passing yards allowed per game) to No. 16 in 2018 (237.8 passing yards allowed per game), doing so with their number one corner, Pierre Desir, already having been waived by three NFL teams since being drafted in 2014, and Kenny Moore II, who was an undrafted free agent out of Valdosta State last season.

** 2nd
How do we know whether or not his system will work with Parsons if they have never worked together? But here's what I do know and this may not count for much but he's NOT here as DC w/o convincing Jerry, Stephen and Schotty Parsons will continue playing at an ALL-PRO level.

Good research on point 1. On point 2 I don't think any of the names you mention would have needed any convincing, rather that this is just to be expected.