The major issue with playing both Berna and DC, while i absolutely love both, is that we lose our long ball treat.
When ManBro is on, either Ronaldo or Manbro can be reached so the opponent cant doublemark them. We saw this against Athletico gaydrid when ManBro was domminated by one CB, but because of this only 1 was marking GOD, so GOD won like most of the duels and we stretched them as fuck.
We really need to keep that in out play. This is what i like about Kean. Quick, agile, strong. Can also be used as a secondary target to quickly play forward too.
Now with Costa and Berna, we need our midfield and CB's to really step it up with their accuracy. Quick long ball, not good enoguh. Needs great movement and precise long passes to Ronny or into feet of the two wide players. Thats significantly harder to do so, if you also want them not to be freeflow, but in a tactical system.
Which is why i liked the switch from Manbro to speed. But if DC returns to his goddamn expected good form, then Allegri will have to solve this.
But people largely underestimate our ability to play vertical passes with players like cancelo, Can, Benta, DC, GOD or berna running around it