The distinction between Others and wights has me confused. Throughout the first four books I thought wights were just another name for Others - similar to how Martin gives more than one name to lots of characters. Sometimes people refer to Loras as Ser Loras, other times the Knight of Flowers, etc.
Same killed something with his dagger, and everyone said he killed an Other, but what was different that "Other" and all the Wights we have seen?
I thought Others were undead with evil ice swords, and were a more powerful, intelligent bunch than wights; kind of a leader class. From a practical, fighting standpoint, the distinction is pretty negligible aside from the weaponry, so I suppose the terms would get interchanged. IIRC there's some small brouhahah made over Samwell killing not just a wight but an Other. I'd love to be corrected in this if it's a misconception on my part...
Back to Bran, though - perhaps the COTF/the 3EC became interested in Bran because they knew he wouldn't be able to physically leave their domain on his own power since their numbers are dwindling, and it wouldn't be likely they'd find a talented volunteer like Brynden again (assuming Brynden was a volunteer). As for Jojen, his greendreams seem to convey information to him metaphorically, so maybe he's only now beginning to piece together the true meaning of his dreams about his own fate.