According to articles it was stated that Zachary was consider to be the role of Lex Luthor not Clark

But I feel like Michael was the right pick for Lex while Zachary was a great pick for Shazam

Was it true that Jensen Ackles and Eric Johnson were considered for the role of Clark Kent?

Tom Welling once said he would have liked to portray Lex Luthor. It would be like casting against the type: Tom Welling rose to fame through the role of Clark Kent/Kal-El/Superman on Smallville, appears in a different Superman related media but as Superman's archenemy Lex Luthor.