I'm a little confused about how the game develops in Act 2.
Seems to exists 2 different ways to reach Moonrise Towers, and I'm not very sure if one exclude another.

At first, I entered the area from the south east, where you meet the goblin group, but I didn't show them the Lyre, so pretty much that path stopped there.

Then I entered from the north path, through Grymforge, reached Last Light, fought the Marcus group, killed him and saved Isobel.
Now I should go to the Moonrise Tower, and the soldiers outside LL talked about an ambush to a cultist group, but...

What now if I go to the Tower with the goblin group, and not from the Last Light? Can I do that even if I'm doing a "good" run?
What if didn't go to the Last Light at all, and only followed the goblin group?