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I believe you messed up that quest. the actors must have just used the gem and left. if you'd have taken the gem to them yourself you would have witnessed what happens and you could go after them. I'd reccomend reloading a previous save since the quest is worth some nice xp and you get some nice equipment (including a pair of Boots of Speed).
as for who to drop for Imoen - I'd say Jan. Imoen can handle all your lock-picking and trap disarming (might need help from a potion now and then though) and she's a much better mage than Jan. practically Imoen and Jan fill the same role in the party and with Imoen around Jan really becomes a lot less useful.
on the other hand Aerie is a mage/cleric which means she has an impressive array of spells available. plus, with right equipment (Bladesinger Chain, Crom Faeyr...) she can be used in the front line with your fighters.
all in all I consider Aerie a lot more usefull than Jan.
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