[Zak Keefer] We underestimated this at the time, but Colts lost a heck of an offensive mind when Nick Sirianni left to take the Eagles job in 2021. Though Reich calls the plays, Sirianni had a huge role in game planning/scheming/play scripts. Colts' offense hasn't been the same since.

https://twitter.com/zkeefer/status/1587458755549171712?s=46&t=q_HeyZ0J5RzhjNtYFd3Dyg