mapKalliope, where have you been? Wikipedia has articles on everything
As to what was said on Kagome and Kanna, I think Kanna does have feelings and sadness about Kagura, but I don't know if Kagome will sense them in time. Also,the tatchi hasn't spent much time against Kanna so don't know her very well. However if she were to turn against Naraku…
You know the old saying, "The enemy of my enemy is my friend".  (Quote)