midfield is the biggest problem. you can get away with mario, cambiaso, kalulu and mckennie and their inconsistencies and the tradeoffs they bring as our attack is stacked. you can even get away with a di gregorio drop of form (if noticed by tudor in time lol) as perin will do the job just fine
but you cannot get away with a slow locatelli and a consistently invisible koopmeiners doing their thingy in front of the defense and now opposition teams discovering that diagonal shots from the edge of the box are encouraged because nobody will step close to the shooter
while i like the fact that we can score 4 goals now, i wish we had the defensive solidity of pirlo's team. conceding sub 20 goals during a league season guarantees 80+ points. it's a matter of coaching too, but we certainly miss one competent box to box to partner thuram to begin with.