Only, when you free Halsin, he says he cannot cure you, but that infiltrating Moonrise towers is your best bet to find out what is special about the tadpoles and possibly find a cure. So that shifts the objective. Now, passage to Moonrise Towers is priority. Halsin can't help you much with that (just warn you about the shadow curse) but Minthara can not only get you there, but also offer you credentials to be accepted. So an evil character could then switch loyalties, killing Halsin who is no longer needed and side with Minthara.
Aye.
But sadly, that doesn't work out well. As in order to free Halsin, you need to kill all the leaders (Or at the very least, incapacitate Minthara).
Which is part of why "Evil route sucks" is a thing.
Had you been able to infiltrate the goblin camp and free Halsin, he could give you the information about the tadpole and direct you to Moonrise.
With then the choice being about killing the Goblin leaders and getting Halsin as a guide through the Shadow-cursed Lands. Or killing the Tieflings and getting Minthara plus a fancy pixie lantern to take you directly to Moonrise.
Throw in the tadpoles themselves being exclusive to the Evil path and now you have a situation where both good and evil characters rescue Halsin because that's the primary thing you're told to do and the best source of information at the time. But then a choice is made. One is a good path that gets the Grove and Tieflings as allies (And will lead to Last Light Inn as a friendly hub). The other is an evil path that will get you more power and take you directly to the source you want to investigate (Plus it could set you up to obtain more tadpoles by doing errands for people in Moonrise enabling more power)
This could, in theory, also open up additional avenues of how the routes play out.
An evil character could still side with Halsin because remaining allies with the people who seem to actually know about the existence of the tadpoles can be a solid strategy.
While a good character could try and convince Minthara to not attack the Grove and do something else to ally with her as getting direct passage to Moonrise is a logical plan.
Thus creating some depth to choices, where you think about how you deal with the information you're provided. As opposed to walking a specific one-dimensional path.
