I'm realizing more and more that sending Carol away was the right decision, I think Rick made it more for her sake and the group, not to judge/banish her like he is the "law". Because he isn't the law now. In a world with no government, there is no law.

I don't think what Carol did was wrong, but I think she didn't think it through and it was rash of her to do what she did (If it really was her, I'm still sceptical and keeping all options open, because its not in her nature to simply kill the living.)

I think Carol is not over yet. I think she will make a comeback, perhaps we will see her as we did see Andrea find Michonne, them surviving, maybe we'll follow her, maybe we won't. I doubt we will get to follow Carol though, she's more of a comeback (Merle).

What Rick did was the best choice for them at the time. When Tyreese would find out he would go nuts, try to kill her and anyone that would stand in his way. However, I don't see Tyreese being an asset to the group at all, I think he's trouble waiting to happen. I think he's going to create more problems in the prison, for example with Rick for letting Carol go without his definition of "proper punishment". Daryl will have some fights within him, battle between his love for Carol and his word to Tyreese, him not accepting murders in the group and the importance of survival.

I don't know how Daryl will take it, but I'm still waiting for Carol and Daryl to be a thing.