Have been down this road before when it comes to change and coworkers being territorial.  What they seem to forget is that with change comes discomfort and fear of the unknown.  However, it is also how we grow.  If one does not embrace it and take the attitude that change is good and open their mind to new ideas and perspectives, they will sit in the back and soon be out of date.  I learned to embrace it and go with it, deal with the pain and try my best to keep the emotions in check, don't cling to the old. 

This person may be looking for something they are remotely familiar with to hang on to instead of reaching to find something unfamiliar and uncomfortable.  Give it time.  This is always a part of managing change.