I don't think we need a forward like Icardi. In our formation and personnel he would be much worse than Higuain.
We need a fast, preferably right-footed, forward. Even Martial would be a better fit. He must help Dybala for 2nd balls, CR7 with plays behind their defense. Everything else is a bonus - physique, one-on-one... If Douglas Costa was more lethal and right footed.
Another way to go is Pogba being utilized in a Seedorf role. He actually excelled in it, but in France NT you have the players for a better formation (even without Benzema).