United failed the start of the season not because of Ronaldo, but because they failed the transfer campaign when some players left the team and no one came to replace. Then they urgently bought such a diamond as Casemiro, naturally this began to bear fruit. Now the team has already rebuilt and, thank God, is not the laughingstock that it was at the beginning of the season.
It is better for Manchester United not having Ronaldo, any more because when Ronaldo was in the team their was disagreement between Ronaldo and the coach which was affecting the team in a way, and now Manchester United is doing well because
no player is disagreeing with the coach. I would like to know where you got this information from. Ten Hag is obviously a conflicted coach (if I remember correctly at Ajax he also got rid of a promising player who then went on to perform well) and conflicts do not necessarily manifest themselves immediately or even in the form of scandals. For example, if Rashford leaves for PSG, among other things, because he does not like Ten Hag, will we find out about it (at least immediately)? I highly doubt it.