Well, Lex was really intelligent... I'm sure he must have foreseen that Clana would not last... Maybe he already saw the sparks between Clois... Also, he must have made his research after leaving that lab. Learned about what happened to Clark during the time real!Lex was dead and all...
----- Added 34 Seconds later -----
Impossible, he was in that room which Tess opened...
----- Added 34 Seconds later -----
Impossible, he was in that room which Tess opened...
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