It's possible everyone is right at the same time. It doesn't matter which came 1st or more detrimental, Fields made poor choices and some poor throws, Getsy called a terrible game, and the Oline was trash. None are really going to be successful if any of those are off. Given the lack of talent/coaching, you're likely to see at least 1 of the 3 being bad every week usually more.
It just sucks that the possibility of going into next year wondering if Fields is worth extending or moving on from is very likely.