I think Octavia's relationship with the Grounder only known as Lincoln, for the moment, is something out of Tarzan and Jane in a certain way, but that is still to be seen in future episodes. But for all I know that relations with The 100 and the Grounders will not be so friendly at all, as long as Bellamy is in charge. Some may want peace, others may not, and then it won't be long before all hell breaks loose. As for redemption in this episode, the lesson of all is this: What's done is done and it cannot be undone. But you can redeem yourself from it and work towards a better tomorrow.
As for Clarke knowing the truth in the last few episodes, now she will be resentful to her mom for all that I know. But soon, we shall see how things turn out to be in the end folks. Although this new member of the council, I believe there could be a foul smell in the air about her, but we'll see that soon enough boys and girls.
God Bless and Enjoy The Show!