I think you need a better transition from the troll hoard to the Rivendell cave. Way it is now, almost makes it seem like the trolls are squatting on Elrond's front yard.
Hmm, I could just remove that short bit with Dwalin saying "I cannot see where the pathway is, do we follow it or not?" So as not to suggest that the back of the troll cave leads to Rivendell. I believe one of the fanedits has done something like that and it worked out pretty well.