Sorry mate but i think i'm going to have to disagree on this one. Yes, Obi Wan didn't think it was a good idea, neither did Yoda or the council, but Jinn did. Obi Wan was a loyal Padawan and didn't want to let his master down by not carrying out his dying wish. Obi Wan convinces the council to let him train the boy due to Jinns dying wish, and the reemergence of the Sith. Yoda isn't keen because the meaning of the prophecy isn't clear. They agree anyway because of Anakins talent and the importance of the situation. Obi Wan starts to have doubts and talks to the council. This is Obi Wans first padawan, he's going to be nervous with such a responsibility. Yoda and the council have seen Anakin grow, and though he is a little arrogant, he hasn't exactly let them down yet, so they encourage Obi Wan. Once Anakin has turned, Obi Wan berates himself. Maybe the council couldn't have seen it because they weren't around Anakin so much, but he reckons he should have seen it. He reckons he let his pride blind him. He blames himself. I think it just shows that no one really knew what the prophecy meant and that none of them could have anticipatedwhat would have happened. Remember, the Dark Side was clouding everything. So i don't think there's that much of a contradiction, just change over time.