My kids' sponsor parents (the greatest people on the planet by the way!) were friends of a friend, but we had never met them. In an unusual way, the sponsor folks became life-long friends with my sons, and their S. Dad read them the oath at commissioning. They hosted my kids all four years through holidays and breaks, weekends, etc.
Sometimes these things just click. This mom is forever grateful.
I know people who have had great relationships with their sponsors even though they were "assigned" and had never met.