Yes a variety of reasons, like you make bad decisions and throws.
Are you honestly arguing that increasing Ints (going to almost the worst in the league) decreasing TDs, and a worse win loss record is sign if a guy improving?
At this point you have no credibility because everyone great and improving and the proof is “context” and bad teammates.
Passer rating and QBR are a measure of overall numbers. Go ahead and tell me which numbers contributing to that don’t count for him. Instead you dismiss it because his numbers are bad.
lol ... no im saying that look at his team to determine what is going on. Numbers are meaningless unless you provide the context. Were they bad throws? were they dropped or tipped passes? was it a break down in protection? was he forced to throw the ball too soon? was it on him?
It absolutely does not mean a player is in decline when his numbers drop. Was Brady in decline in 2013? in 2018? His numbers dropped, his ints increased... and no it did not.
simple fact is, when he has played a full season, the ravens have won. He's 37-12 as a starter. Thats not a middle of the pack, mediocre quarterback.