Zouma barely played last year as he was recovering from a major injury, Kenedy was out on loan for half the season and barely played after he returned. Cahill, Luiz and Moses meanwhile were the core of a frankly brilliant defensive unit. I'm not sure why you think a team containing the likes of Hazard, Costa, Willian, Pedro, Kante, Matic, Luiz, Courtois, Azpilecueta etc would be considered poor. It's a feck lot stronger than many of the teams that won the PL in the past, including the last United title winning team.