Juventus have been so un-Juve-like this season. The depth of talent in attack is something we haven't seen in Serie A in some time, but without Bonucci their back line has gone from world class to hot garbage, and their midfield has looked uncharacteristically frail as well.
Their midfield is Khedira and Pjanic. They're underrated and not sexy, but at the same time, they will get destroyed by a midfield like Madrid's.
Bonucci is struggling at Milan, even before the red card last game, and Barzagli has not exactly been a speed demon for years.
It's funny, but a huge amount of their problems comes from the right back spot - same like Barca last season. No Dani Alves, and Allegri is using Lichsteiner sparringly (and he's gonna be 34 in January) and Sturaro has never played the role before this season.
They're hemmorraging from that right back spot - especially when Sturaro plays - and it reflects on Pjanic or Bantacur (whoever is playing RM) and on Cuadrado/Bernardeschi on the RW.
Their whole right side is a level below what it was last season. People don't understand that one position with a player not playing in his role or just an inferior player there effects the whole team - especially the guys playing adjacent to that player.
And yes, Bonucci not being there hurts - remains to be seen if Rugani's ready for the big matches. Benatia (IMO) is not the answer.