Lampard managed Chelsea for one and less than a half season. He came in after when Maurizio Sarii left Chelsea for Juventus and actually in that season Chelsea did good under Lampard as manager. Chelsea finished 4th that season compared to previous where they finished 3rd under Sarri. Lampard is a new manager and has lot to learn before he joins elite group of managers but right now he is right on the tracks of it. Everton back to top under him feels hard for me but they should become better under him.