I agree with C_A.
Why if H. G. Wells can travel between each dimension and back and forth in time why couldn't he go back and stop Tempus from outing Clark in the Alt-Universe? He could have taken an earlier version of Alt-Clark to the other universe just as he did in Lois and Clarks. He could have the opportunity to train become the hero he is suppose to be and even have the chance at a private life. If he pulled him out early enough he could even have a chance at meeting or saving his Lois.
TLAT
