Originally Posted by
Iscah
Urianger (and/or Thancred) has to be there. We needed a healer or tank for the party.
And seriously, when was the last time he turned up out of nowhere to give us random stuff? That's how they were using him when he was tied to the Waking Sands and they wouldn't move him elsewhere except for a fleeting cutscene appearance. They've broken that approach now and he's free to actually move with the plot and stay there.
And we are very unlikely to take people from side stories on MSQ adventures. At very least, the character needs to make sense whether or not we have met them before, with at most a variable line or two, so anyone who considerably changes over the course of the story is out. We could maybe meet Snoegeim again if she's an occasional consultant sort of character across several plots that could happen in any order, but Deryk seems unlikely.