Except BBZ says possession style is outdated and we shouldn't play it.
Malcom can't show shit from the bench. If Rafinha fails, Bob will play on the wing.
Possession style is good enough for La liga and EPL, as you can see in Barca's and Pep's cases.
Why?
Because you will play mostly against mediocre and weaker teams here.
And if you keep possession, you will:
1. have the ball all the time
2. the opponent won't have too many chances at all
3. you will eventually score due to quality individuals like Messi, Suarez, Coutinho who will score a goal this or that way eventually since you have a ball around the box all the time
A CL is a different story.
Opponents there are capable to stop majority of our slow-possession attacks and they are also capable to hit you hard and finish you on counters, unlike Getafe and Las Palmas.
So, if you play against Getafe and just pass a ball around the box, gaps will open eventually and you will have a few clear chances this or that way.
If you play against Atletico, Juve, Bayern, Liverpool and similar, they will neutralize our attacks and score easily on counters.
Further, to play faster, you don't need ONLY Dembele and Malcom.
For example, we played some counters even in the first 60 minutes with a faster transition from Busi, Arthur and Rakitic.
Or with long balls from Rakitic (for example a first goal, his long pass to Alba, who crossed to Coutinho).
So, to play faster, you don't actually need FASTER players only.
You can play faster even with a turtle slow midfield like ours, as long as they are faster in transition, and if they pass forward fast in key moments (and attackers need to move and position themselves well), like today.
But I guess that for majority of people, a recipe for playing a faster, more direct football is: buy two fast wingers and pass the ball to them who will create a havoc with their pace, lol.
One of my friends is a professional footballer and whenever he played (on an amateur level) with us, he always yelled at me (or some other guys who dwelled on the ball): pass the ball (as soon as you can), a pass if always faster than the fastest player in the world.
Aka: a well played, fast and a well timed pass to a teammate is always "faster" than the fastest player in the world who is running with ball IN HIS FEET.
In Barca's terms: a well timed one touch pass from Busi/Arthur/Raki to Roberto/Alba/Suarez is always faster and a more deadly option than a fast player (Dembele/Neymar) running with the ball from a center of a pitch to an opponent's box.
It doesn't mean, though, that faster players or wingers can't help.
But you can play faster and direct football even with players of average pace, as long as they are executing passes and movement perfectly.
We played the fastest football under Pep with Busi-Xavi-Iniesta where two of them were turtles.