2. They give us a reason not to abandon all hope
3. They're chemistry is surprisingly really strong
4. They can both look over Dean together now
5. He would have saved her if Lucifer hadn't trapped him with Holy Fire.
6. But, now that she is gone and probably in Heaven, she could be an angel which makes her the perfect mate for him. (^_^)
7. He made her smile/laugh in Abandon All Hope.
8. Their little scenes were enough to make us laugh -
Jo: Never heard of a door handle?
Cas: (teleports outside) Of course I have.
9. We can think that she looked over at him before their last picture was taken.
10. Because Future!Cas and Future Jo would have kicked ass together!!!