First of all, Liverpool were significantly better under Klopp — their expected -
goal differential per game with Klopp was 0.53, and 0.33 with Rodgers — even if the results didn't show it.
Their underlying numbers weren't quite as good —
per expected
goals, their attack was roughly on par with Borussia Dortmund, their defense was the best in the league, and their expected -
goal differential was about 20
goals lower than their actual output — but their performances still more than deserved the Bundesliga title.