I simply provided my reasoning why praise for PJ's responsibilities as OC needs to be decoupled from his praise as a head coach. It's literally a separate role. How the defense never measured up to the offense was used as an example to reinforce the delineation between the two. As far as what you commented on, I recall at least one player saying that they practiced against the option. I do not know if that is the reason and did not posit one myself.
I never brought up Collins either but since you did, I do not hold him responsible for the gameday defense (or offense) coaching but on the hires he makes to run them. To me that logic is similar to blaming a technical manager for code that one of his devs wrote because he might have been able to write it better himself. People should be competent in doing their own jobs, which is why I am concerned that Thacker is supposedly still calling plays. At worst I would have preferred for Collins to step into that role similar to how PJ was the OC or Manny Diaz was DC towards the end of his stint, so this is the worst case scenario as far as I'm concerned. I am hoping that there is "some" involvement by CGC and that roster turnover provides a spark somewhere but those are just hopes.