Shadow almost always pops approval from good actions. The only classically good things she doesn't approve of is telling everyone and their mom about the tadpole.
If I remember correctly she approved of robbing the fishermen in EA. She is all about getting to the goal with a minimum of complications but enough means. She is not 'good'. I don't have enough evidence to call her 'evil', despite her service for Shar, though.
I don't agree with what he says about Wyll and Gale: they are not good aligned. Maybe Wyll after the change, but he was more than willing to torture an innocent man for information and he didn't care at all about Barcus on the windmill, until he got what he wanted from that goblin.
Gale can sell you out to Raphael, if you don't do exactly, what he wants, for example giving him magical artefacts.
Gale seems quite neutralish to me. In EA he is quite easy to satisfy: just give him two artifacts and he would love you.
I would actually love to be possible to push the new Wyll on a darker path. I think if you save the tieflings but support what Mizora wants from the new Wyll, at least for the time being, you might get that. I need a fourth character in my Dark Urge run. One who I both like and fits mechanically with the group. Problem is I don't like Lae'zel and she clashes with SH, Gale works fine with SH and Astarion but is a bit bland. Minthara... unless she falls from grace with the Absolute is a difficult proposition. And yes, I really have to mess up in the tiefling camp, which s possible but in general, the tieflings & Halsin (one of the druids will even allow you loot the treasure of the Grove) offer a way better deal than Minthara, at least in EA.
