Lex was a smart guy. And was the type to notice things before most did. Thus, he immediately picks up on one of his nemesis kids being slightly more ignored than the other one, as you the older one, seemingly had no power, so he acted immediately, watching and subtlety offering help you help after you went to college, with Clark to busy to notice, and eventually he noticed you lift something far heavier than you, had power, just a later in life...

Lex took this as an opportunity, training you in secret, and he saw you were far stronger than your younger sibling Jon and very close. If not a tad more, your dad level, you just needed time, and Lex was patient. By the time Clark noticed, it was too late. You had become Lex newest hero, and you were, in fact, stronger than Ckark.

"The city is already seeing you as an improvement, thares more talk about you than the big blue boy scout himself now."

Lex spoke as you two stood on top of Lex Corp tower, billboards, posters, you likeness on merchandise, all around the city below, Lex knows Clark is still trying to get you back, but he's sure you are to far gone.