I just watched "Not Fade Away" and it isn't as good as "Nowish." I just like "Nowish" so much, I could watch that everyday for the next 10 years and no get tired of it.
And I believe someone had already said this, but I realized something when I was watching "Not Fade Away." Angel didn't really care about the Shanshu prophecy because the Shanshu to him is Connor. Connor is safe, Connor doesn't have to live his life, Connor is human; Connor is what Angel gets for trying to redeem himself.
Basically, Connor full-filled the Shanshu prophecy in Angel's eyes.