You have options for a, b, and neither but you are missing the option for both. I feel that both have major effects on the other. I dont think any offense can be successful with horrible receivers or with a horrible qb. I think our receivers are more horrible than our qb but thats just us. Want to see a great qb with horrible receivers, look at the 2019 patriots, very mediocre offense and made the qb look done. Brady goes to tampa and gets good receivers suddenly he is good again. But visa versa take Indy the year Manning got hurt and their horrible backup qb played. The receivers were fine but the offense was not good. Both effect eachother a lot, equally. If Brees was still here and a few years younger, we would look like the 2019 patriots offense. If we had Michael Thomas with Trevor Semian throwing to him, we would look like Trevor Semian with the Broncos who had some decent receivers I believe but was mediocre. If we brought back Tom Savage who is worse than Semian and Hill, but equal to our receivers, we would have the worst passing offense in modern nfl history.