So they found Emmet and he is alive. Now what?
They gotta pull something big out of their ass to keep the show going now.
I'll take a stab at what might happen in the finale:
Emmett hasn't found the Source yet, so he'll insist on going back into the jungle to find it. The others refuse to let him go by himself so they accompany him. They find the Source, and Kurt betrays them all and tries to grab the Source for his employers. The Amazon, however, deems Kurt unworthy and kills him in grisly fashion. The others are in great peril as well, but at the last minute, Lena saves the group because she is the Chosen One.
Let's see how this plays out...