Regarding Forwards:
In reality the only one that can actually receive a ball near the little area or inside of it and have the tools to create and finish sthg. in tight spaces is Amad. He is not bulky a la Kun, Rooney and Tevez, yet like those he is the one in the team that looked at times that he can manage playing with the back towards the rivals net, bring others as a pivot, has the dribbling in him with a second march to arrive with a control ball from outside the area, he can drop deeper to play as mediapunta or launch his attack from the flanks and have showed at moments enough skills to resolve in technical demanding situations in the last metres.
He lacks power in comparison with the mentioned and we don't know how much he can be trusted with goalscoring regularly, yet he has showed at times some of the mentioned trais that are very useful to play as second forward/striker.
Of course United needs so bad skill fellas on the mid and flanks that he is needed there, yet it can be a bet.
Regarding CBs:
Harry can only be trusted in the way nowadays it's trusted to score the goals he does: dead balls situtions and the ocasional play on the break and scoring on the run after a cross. Yet managing long high balls, operating with the back towards the rivals net, in tight spaces, not getting anxious in those, not doing the regular bad pass or miscontrol, it's trusting too much. De Ligt looks better than him on the ball, facing more than probably the same issues with what the role demands like Harry and being so far a lesser threat with his header in dead ball situations.
So that leaves Yoro from the CB that actually looks a bit more confidence on the ball, young enough to convert him, with great height and actually some experience as Striker in his youth as better option for a pure classic number 9.
PD: Licha if he some day returns, clearly has the confidence and shot in him, yet he should just arrive MORE like he did at times so far while still playing as a defender, he must be used more in such surprising role, attacking the space, receiving a second ball or grabbing a rebound. He is the type of defender with the necessary composure and strike that can end with quite a number of goals every season.