For those of you who seem to live under a rock, the issue was [i]availability.[/i] Peter Dinklage simply wasn't as readily available as Nolan North. So they opted for Nolan North as the new voice of Ghost for the Taken King, replacing the old lines as well. Wouldn't make since for Ghost to have one voice for the vanilla missions, strikes, etc., then have him suddenly switch voices for Taken King content. Of course, North needs to work a bit more on his delivery of some lines. Better yet, Bungie could have at least modified the script a bit.