All the best strikers in the league are in the mould of Zlatan. Kane, Costa, Lukaku are Physical, hold the ball up, make intelligent runs, have a goalscoring instinct. Zlatan isnt a targetman, he is a no.9 with some playmaking in him Go outside of the league and all the best teams in the world have a dedicated no.9, Higuain, Suarez, Lewandoski, Ronaldo.
Zlatan has better movement than Martial and Rashford; this isnt football manager where pace means good movement. Good movement requires intelligence first and foremost, then pace is a bonus.
If they cannot perform as a striker in Mourinho's system then they are not strikers period, they are wide forwards that support the striker aka Neymar, Robben, Hazard, Bale, Dybala etc.
If you think we are going to play 2 dedicated strikers in a 4-4-2 then you are mental. Playing a 4-4-2 requires a no.10/second striker hybrid to play with the striker ie Griezmann and Rooney, or else you cannot link the midfield to the attack.