The last chapter did not really contain anything, just clarified the past and introduced this chapter. It should actually be in one and the same chapter, but someone might have wanted to see how many readers there were lurking around.
And behold, there are many people that were upset at the short chapter, must that not mean that they love the story? =D
Sorry~
Also, the last chapter were in no way changing the theme in the story, his mind have not changed at all.
Sesshomaru2