There is is an important backdrop to consider to a current debate in on this page.
Acquiring the services of Ronaldo was never the plan in the summer 2021.
Another player to consider in this was Edison Cavani. Solskjaer spent the spring of 21 convincing Cavani to stay for a further season in order to be the experienced striker to help with setting the perceived future front line of Rashford, the incoming Sancho and Greenwood (which would also be backed up by Amad Diallo).
The other signing aside from Varane and Sancho was supposed to be a central midfielder. The number one target for this position was Eduardo Camvinga, due to his contractual position at Rennes. But he chose Real Madrid as his priority destination. The next choice was obviously Declan Rice, but that would be difficult due to his cost.
They would have had to have found a stop gap, sold more players other Daneil James or borrowed from the following summer's budget. But when you consider United paid £75 million for Anthony, maybe that would have been a good decision.
I am not going to get into what occurred with the various players I have mentioned, but to present this as Ronaldo being the excellent example to follow is speculative at best.
The only way in which he would have been a "good example" for the young players to "look up to" is in his conditioning and how he looks after himself.
From a psychological point of view, the presence would have done more harm than good. He was a player obsessed with records and his own individual standing in the game. Rashford, Greenwood and Sancho were players whose confidence would have and did wane with the spectre of Ronaldo on the pitch. Particularly, Rashford, who does not even the mental strength to consistently lead the line for United as we we are seeing now.
I have always said that Greenwood has far superior mental strength on the field to that of Rashford. Greenwood, would have been playing in the central role in certain matches with Rashford on the left and Sancho or Diallo on the right.
Now, I am not criticising Ronaldo. He is an elite player who will be remembered for many years to come and he stands as one of the greats in the game.
However, he was not right for United at that point in time. The only way that Ronaldo coming back to United would have worked was if United were a team of Champions. They were not ready for him. If they were a team that had won the league the season before, then United could take that opportunity to bring him in as consolidating force and as an experienced player to help the team make a headways in the Champion's League.
The conversation between Solskjaer and Ronaldo would have had to have been "Ronaldo, we won the league last year. We want to win it again this year, but we also want to go for the Champions League and we need your help in certain moments in the league and the big moments in Europe."
Ronaldo would have had to agree that type of role. Fanciful idea, yes, but it was the only way it would have been a success.
Do I think Greenwood has the mental strength to return and play in the Premeir League? You are damn right I think he does. He has that elite, tunnel visioned, mental strength that Rooney had when he used to back to Goodison Park, that Beckham did sfter France 98 and what Ronaldo has after losing a new born child and then playing against Arsenal a few days later.
The journalist Phil Brown describes it as having "sociopathic element to how you are mentally wired" in how you can perform and separate external factors from what is unfolding on the pitch. it is a characteristic you associate more with individual sports such as boxing or tennis.