I don't recall the Colts defenses being "really" good, they were certainly better than what we fielded this yr (which is saying nothing) but "really good" seems like a stretch.
Zimmer's defenses were the Prescott of defensive numbers. Great against bad teams and horrible QB's, choked like hell in crunch times and big games.
And Gannon implemented his defense the last 3 yrs in Arizona, and the results were awful.
Scoring defense:
2023: 31st 2024: 15th 2025: 29th
Total defense:
2023: 25th 2024: 21st 2025: 27th