Define fellowship.
How many dinners have you had with departed saints? How often do you talk to them, and they talk back? Do they give you presents for your birthday?
They are as much my brethren in Christ as are the believers I worship with at my home Parish, the believers I meet only once one Sunday when traveling, the believers on the other side of the world whom I will never meet in this life.
Do you think such triviality as time or space or even "death" disrupts the Body of Christ? I certainly do not.
Dinner? Identifiably two way conversation? Birthday presents? What a bunch of worldly hogwash!
Now: My fellow Catholics will get this; I wonder if you will. I have dinner with the entire Church, all the Choirs of Angels, and most of all the Blessed Trinity every Sunday and sometimes on weekdays.