First of all, I do believe Man United should have a more well established coach, and that the overall climate at the club is not at all favorable for keeping Ole around. However, having Ronaldo, who's averaging around 7 pressing actions a game, instead of Cavani, who averages 13 presses a game, or even Rashford who averages around 10, might be a factor to explain why United has been offering opposing sides so many easy counter attacking opportunities. It obviously doesn't mean having Ronaldo is a net negative (it's most definetely not), but is something the team has to adjust to. About other players, Bruno and Greenwood have indeed been pressing less, so that should also be considered. But in the end this could mean that Ole simply hasn't had time to address the new circumstances yet, and players understandably haven't fully adjusted to playing with Ronaldo. This will probably get downvoted because it might sound like I'm defending Ole but I'm just stating something I believe is a fact: it's still early in the season and the team has changed a lot from last season.