How does it have very little to do with Fox? Nagy fixed it, or at least made drastic improvements to it, in one season and its apparent Fox did not.
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Regression means something was at a certain level and then declined. So the point is Fox (more precisely Ragone and Loggains) worked on his footwork but then most likely due to his learning a new offense with new WRs his footwork declined from where it was in the previous year. Hence the term regression being used ie it was fine before but then got worse in the new offense.
Trubs has the same QB coach he had under Fox/Loggains ie Dave Ragone. It is absurd to think that Nagy would bring back the same QB coach who is the main guy for helping a QB learn mechanics and footwork but yet Ragone magically did nothing for Trubs footwork and mechanics before this season.
So again, your argument makes no sense. This is stuff Ragone worked on with Trubs last year and got to a certain point. Due to all the shit being thrown at him in a new offense, Trubs let his footwork slip or regress. That has nothing to do with Fox. Ragone then most likely had to work with him to get it back to the level it was before and that will probably be a constant work in progress for a young inexperienced QB.
And your original claim that Fox did nothing for him is just stupid. A college QB with 13 starts in college most certainly has a fuck ton to learn and he did not learn it all this year. Fox's biggest contribution seems to be having Logains and Ragone teach Trubs the fundamentals and how to be a professional. He did that by having an offense that was digestable which is the best he could do with such a shitty WR core. We know there was value in what the Fox regime taught Mitch because Nagy saw fit to keep the QB coach that was the main guy working with Trubs. You don't do that if the QB coach taught Trubs nothing.