Lex walked away quickly, showing excitement on his face. As much as he wanted to disappear immediately, it occurred to him that he had spent too little time as Leo since this persona was created. The same way the Devils learnt of his name from Z, others might take notice of his quick patterns of appearance and disappearance. Of course, that alone would not be enough to give rise to suspicion about Leo being a fake persona.
Still, Lex believed he should be a little proactive and create a solid background for Leo a little at a time. He needed to spend a little more time with his 'coworkers' the way Harry and John seemed to have developed a relationship. That could wait for now, yet he really should at least check up on Z. The poor kid must have been working hard in his absence.