I know I'm spoiled by Busi but he (Song) feels like an amateur whenever I see him play.
I think with current tactics used by martino, song will be an important substitute.
Another dimension to attack once he subs busquets specially in matches where we will face strong defense outlets with the us behind and looking for goals.
That lost possession match was intentional strategy to test extra Model. Possession based model is great, we will stick to it, like forever but changing model during the matches in certain situations could make us more unpredicted.
Example: Team now come prepared to sit back and counter attack, especially in european competition. How about picking them by surprise by losing possession more often by making quick attacks and taking long shots, attempting quick long balls. Deploying crossing wingers instead of incutting-back passers.
I think, thats pretty smart by martino. Will take us to next level. We will still enjoy possession, when ever we like to. But for quick transition to def to attack, song will be an accessory to busquets especially for his energy, tackling ability to win possession in the middle of the pitch, i think.