Ronaldo is unwilling to adapt himself to Manchester United's players. He is performing against his will with Manchester United. And so even though Brenford's defence was weak, Manchester United could not score any goals.
Ronaldo is not happy and he does no longer want to play for Manchester United. He does not want to miss Champions League in very last years of his career. 3 seasons ago, Ibrahimovic still was able to play at top level and now he is mostly missing in all matches when his body no longer allows himself to be ready for weekly matches. Ronaldo knows he will reach to that limit too.
Manchester United's heyday seems to be fading away and the need for a significant team renewal. When Ronaldo was no longer comfortable at Manchester United, inevitably he had to be released and focus on easy players who had more potential. We are waiting for the second week of Manchester United Vs Liverpool, whether it will be hell again for Manchester United, or they will turn things around and get points to move up the rankings in the standings later.
It seems they will have to give Ten Hag more time and they will not ready to fire him in middle of this season. They must resolve the case of Ronaldo before the transfer closing time as soon as possible. In addition, they must find on the market another central defender to replace Lisandro who is not good for that position in Premier League. They can not have a good season if 2 of 3 best central defenders have technical issues: Lisandro and Maguire. Only Varrane can not do anything to secure their defense.