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No point bringing in an unproven manager. The United job is massive would be a huge gamble bringing in someone who hasn't handled that sort of pressure. We need a veteran. Someone like Zidane or Conte.
The hard part in here is that actually the two best managers in the world (and maybe the third better now, tuchel) are actually in the PL and they've been here for more than 5 years, and I think they are better than the rest by a large margin.
So actually, no manager outside of England has been competing against the best in a league format.
CL is another story, even pep gets weird playing it.
So any manager is inexperienced competing against the best.
Can Conte go toe to toe with them? Maybe... for a year or 2 and then leave us with a bigger mess than he found.
Zidane hardest competition has been Simeone who is a bit meh... and a long list of mediocre coaches in Barcelona carried by Messi.
Everyone else is basically unproven, because the media attention we get is only comparable to Real Madrid, and maybe Barcelona (actually Messi, nobody cares much about Barca now).
With this I'm not saying Ole is the man or our best choice, but it's not as easy as Ole out-----> Profit.
tl dr. sadly i think doesn't matter who we bring we will hardly win a league until Pep and Klopp feck off, unless football gives a big shift and lefts them behind in tactics, like happened to mourinho. Finishing 2nd to 4th is the same we've been doing.