ILONG time since we've had a serious contender for best manager in the league. Which with Mourinho on the slide, he most certainly is. Only Wenger for longevity and what he's done at Arsenal you'd put above him. Maybe going back to Kenny's first go-around? Rafa still had Ferguson and Mourinho.
Mate Mourinho has had three bad months which doesn't negate more than a decade of success which is 10x more than what Klopp has achieved till this point. Even Van Gaal has achieved far more than Klopp although it can be argued that his golden years were some way back
Some might reasonably argue that Wenger merits a discussion as well as you yourself concede
Either way it's extremely premature to call Klopp the best manager in the league considering he won one EPL game against a Chelsea side undergoing the worst start to a season in decades