Brady putting worse players on the field consistently is certainly an issue. Shakir being out pretty much tanked the receiving core. Knox is getting too many snaps over Kincaid, Hollins is getting too many snaps, Scantling is getting too many snaps, and Quintin Morris is getting too many snaps.
I'm not necessarily out on Brady but I don't think he was the best hire. The reality is that the offensive coordinator for Josh Allen is one of the most desirable positions in the NFL. It's basically a guaranteed shot at being a head coach if you are mildly decent at the job. It makes complete sense that Micky D was a fan though. Constantly rotating in inferior role piece players onto the field. A running ball control offense to keep his defense off the field. Shocking that Diggs was on the outs after hiring a coach who puts a premium on receivers blocking, something Diggs despised lol.
Also, the offensive line is still dog****.