Rashford saved ten Hag and the season just last campaign, so it is easy to see why ten Hag would have a dependency.
What it does show, as an extrapolation over his tenure is an over reliance on magic rather than cohesion, if you have a star boy winning you games no matter how poorly you look as a team, a lot of pressure is alleviated and you can sell your gameplan to more folk than if things go south and then the underlying fsctors and inner workings of your football is put under the microscope.
When we truly examine ten Hag's rein, we've never looked above average in terms of final 3rd play, in fact most of what we have seen is poorly played out improvisation. Once in a while there'll be individual moments of magic, but our team goals and multiple pass set ups to lead to chances is atrocious. We play wild hero vertical ball that often sees us lose the ball or try to force a shot in a short period of time - other sides put their foot on the ball, take their time and carve out really clear chances whilst we persist with crash, bang, wallop half chances that look forced or ill-considered. It's reflected in the amount of good games that can be counted from us over the last year (literally) as opposed to all the scrappy wins off of haphazard goals and football as a whole.
The big difference for ten Hag between last campaign"s single point failure issue and this season is that ten Hag could be excused for the attackers at his disposal, but really, if Rashford hadn't been a talisman last season, our attacking game under ten Hag would be truly dreadful extrapolated over his two seasons here.