The problem was more that the season before United had many players with more than 10 goals, then Ronaldo arrived and he was the only one scoring. Yea sure he scored many important goals but hampered other players from scoring. All focus of attack was him and nobody else so United were very limited and relying on him. Of course he is a brilliant player but not the player he was 10 years ago, which you could rely on for goals almost every game