Chabad doesnt seem as much concerned with Yichus as others.
Their Rabbinical structure also seems different than other groups, meaning you become a rav when you go out on Shiluchus and start your own chabad house as opposed to others who basically stay put. I am not so familiar with Chabad hirearchy so I cant say for sure, but it does seem that way.
If you ever go to Crown Heights you will see a greater hodge podge of jews from lots of places than almost any where else