I think with the players that truly fit his system, power, technique and pace to burn and stamina of equal measure, a plan B wouldn't be so needed. It's being able to afford those players however.
Klopp is a good manager, he's had some bad times too but he's still young and his principles seem very sound. I agree with some pundits, it seems the players lack the motivation against smaller clubs because against the top 6 Liverpool look imperious