Book Three of Inheritance series: Brsinger (possible spoilers)

I sped through it pretty quickly, but I remember the first two books they made a big deal out of the fact that should a dragon rider die, the dragon dies too, but not vice versa. In this book, Paolini seems to have forgotten that entirely, or forgets to qualify that it only counts while the dragon is young/not full grown.

Also, who wants to bet that

the lady and daughter that Angela had him heal were related to him in some way. Is it possible that the mother is Selena?