Oh course, the focus is on rescuing Elsa, not discovering what happened to 'alas poor Yorrick.'
The warlock's mentions are more off-hand, and not necessarily germane to the main plot -- despite his heroic efforts of finding Elsa and staying with her for the last 8 years as her protector, who really cares who he is, you know?
And couldn't he have gotten word out to SOMEONE that he found Elsa and needs help dispelling the enchantment? Spielburg isn't that big a place, you know...
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Again, having the dialogue tree in the VGA version rather than the EGA parser system will guide you to all those potential topics without having to make much effort on the player's part...
Although, I do wonder: do you have to look at his Wanted Poster to trigger the future Warlock topics? (To "know" about him, therefore you can/should "ask" about him?) Or have him mentioned in another NPC's exposition for his topic to trigger?
Or are his topic always there in the dialogue tree without yet knowing about him (by not triggering them from any other relevant NPC dialogue mentioning him, and not viewing his Wanted Poster)?