Creon is not the one who comes to Oedipus first, it is actually the blind seer, Tiresias, who can "see" future, past, and present.
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Creon only exiles Oedipus because he wanted to be banished.
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It is not wise to try and compare Oedipus the King and Oedipus at colonus. Traditionally these works were written separately and should be viewed as such. While it is difficult to ignore prior knowledge, unless you are writing specifically comparing the two characterizations (while considering the fact they were written years apart and Greek dramatists are known to change characteristics of characters), an analysis of Oedipus at Colonus must be considered within itself and not as part of a trilogy.