There are a few examples of this just look at the most recent one anakin and obi wan were best friends and brothers before Anakin fell to the dark side and became Lord Vader count dookoo was good friends with Yoda and quigon jinn

I sooooo hope that we get the new Jedi orders canon because I truly believe that the yuuzahn vong war would make for an epic new series the vong were the perfect enemy of the Jedi being completely out of the force they were a biological power all there tech was alive