All the training and tips and good vibes may not have added up to real talent and a realistic chance of hitting the field. With all the turnover last season - they never activated him. That says a lot considering we fielded the likes of Evans and Skura.
I think you have to factor in a new coaching staff into all the moves they made and will make. I'm sure they've been scanning hours of practice rep footage and preseason footage. The new o-line coach probably has ideas on guys to develop for the practice squad.
This is a top to bottom roster overhaul. And probably needed.