Well it is extremely true that we are lacking energy in midfield. Let's not bash Khedira, Pjanic, and Hernanes. They all have qualities that make them useful to the team. However, it is true that they lack the physical abilities of the players that we lost (Vidal & Pogba) and in today's game, speed and muscles are extremely important compared to the old days.
The only four midfielders that can offer such level of energy are:
Marchisio (high frequency of injuries)
Sturaro (although not juve quality)
Cuadrado (although not his usual position)
Lemina
I honestly think that Lemina needs to start whenever possible. He is in the mold of a modern midfielder (strong, fast, technically sound, can defend and attack). The three midfielders that started yesterday are too soft and one dimensional.
Let's not panic. We are just 1 or 2 signings away from a great midfield again. (Matuidi, Veratti, Witsel etc.) Until we sign them, we just have to pray that Allegri makes the right midfield selection. And that is having at at least one of Lemina, Marchisio, Sturaro, or Cuadrado in the center of the park in every game.