Great movie ............ BUT

Rating: 7/10 (23 November 2014)

after that they find information in to Murphy's room which was done by gravity to give them the code to find the space center and here's some how there is some contradictions in the following event that after the space center offering him to go as a pilot and then there was a message sent to tell him to stay and not to go so why he sent the message stay after sending the message of the place of the space center he can not send this from the beginning and may be he realized later that he should save the earth by telling the earth by telling them how to know the universe around thing to tell them the truth and how they can save the planet that sounds OK ,right ?
NO, because he is not affected by time he can try infinite many times in the same second and if he didn't go at all he will just allow the earth to end by 25 years . I wish really to understand why he made this so if any one has any explanation please just tell me.