I am hoping Neji and Chouji, but maybe not. I am kind of mixed about whether or not it would take away from the arc if they survived.

I think he could also just be smelling the two of them together again. I don't think he knew that they recombined till then. If not....

So here is who it could be

1. Neji and Chouji
2. Jounin Squad
3. Sakura and someone else
4. His sister and her dog
5. Shino and his dad
6. Jiraiya and Kakashi