Manchester United can’t rely on Ronaldo forever.
Although Ronaldo may not need replacing immediately, as he gets older, he’s going to find it difficult to play as many games as usual. David is still only 22-years-old, so can be brought in to rival Ronaldo for his place, and eventually take over the starting role when Ronaldo moves on.
David has managed 69 goals in 178 games in his short career so far and has an even better goal ratio for his country.
With Manchester United possibly playing in the Europa Conference League next season, it will be an excellent chance for them to rest Ronaldo, and allow David to gain some experience whilst adapting to Ten Hag’s system.