I think Martez Wilson is perfect for a 3-4, but I don't think Galette will flourish in it. If this is a true wholesale change, we'll probably see a pretty large defensive roster overhaul.
I have to disagree with your Galette comment. I think Tez should do well, but I also think Galette will outshine him. IMO he is by far the best passer rusher on the roster. He has good speed, very explosive, and he has a good set of pash rush moves ( especially his spin move). My concern with him is his health.