I was referring to your idea of replacing Higuain with Dybala. How do you know it would work? It's just your assumption. Palermo, where Dybala used to play as 9 (I suppose, I did not watch too many of his games there), had much more space upfront because they were not dominating opponents as Juve do. Consequently, Dybala had the chance to roam at defenders instead of playing in line with them as Higuain usually does. If Pipa moves back he lures defenders with him so that Dybala has some open space upfront to burst into (second goal away against Tottenham). As Allegri said many tmes, Dybala has more to his game than just to be a striker. He should try to imitate Messi style who could be a striker if he wanted to but Barcelona decided to buy Suarez and play him upfront. In that setup Messi operates on the whole oppenent's half having kind of a free role. I know Dybala is no Messi but he's neither a better striker than Higuain. I'm yet to see him scoring a header and what would he do if he had a shooting opportunity on his right leg? Whereas Higuain can finish with both his feet equally.
I want to replace Higuain with Dybala because only one can be on the field. And that's very clear at this point. We look better in a 4-3-3, virtually regardless of who is on the field. It could be Mandzukic in a 4-3-3 and we still look better.
So I want to get to a 4-3-3. In that case, one of Dybala/Higuain is dropped or sold. I'd rather keep Dybala. My argument for Dybala over Higuain as a #9 is the fact that Higuain does not offer anything additional despite his height and weight advantage in terms of being a target.
Higuain does not offer an outlet to break the press with a high ball. He does not offer a crossing target with his head. Neither does Dybala.
But as a #9, Dybala can actually get in behind the CBs with a through ball. He can pin them back just like Higuain because of the threat of getting behind. He can move from the CF position and drift wide to collect a ball, and ask questions of the CBs whether they want to follow him or not. He is quicker around the box. And let's face it, Dybala's 1st, 2nd and 3rd instinct when he gets the ball is to shoot.
But if it was really up to me I'd sell both and buy a real #9.
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Pretend Higuain is a CM in this video clip. This is basically what Dybala looks like as a #9:
[video=streamable;dyp9a]https://streamable.com/dyp9a[/video]