..." and that a Ford-Boyette-Nelson DT rotation is able to keep them as clean as units with Malcom Brown and Hassan Ridgeway were able to do." I think this is least likely of your 3 defensive scenarios.
They'll probably be okay most of the time but not all the time.
Been meaning to ask, was this why they moved to the 4-2-5 (is it a true 4-2-5 or a 2-4-5)?
I'm not sure yet, that may be in order to suit Cottrell and set up Ford for success. The 4-2 Over front makes more sense for the 2016 personnel than the 3-3 Under they've normally relied on.