You have to "get the club" and have "United DNA" basically. If you don't have these, as a manager, you will inevitably fail at this club. Where as, you could be absolutely amateur level as a coach, as long as you have the special United sauce mentioned above, it's inevitable you will go on to lead the club to a sustained period of the highest success, just so long as you are willing to sit down and shut up and take what you are given when it's all shite at the start, you don't want to be a spoiled impatient brat after all.
So, to sum up, in order to lead this club to success, the only thing to do is keep a hold of the most amateur manager, potentially in the league, and that no top club in the world would touch with a 10 foot barge pole, and let him have 5 seasons and all the funds he wants, it will work. Pochettino doesn't have that United DNA, he doesn't get the club like Solskjaer, it doesn't matter that he's proven to be 10x the manager Solskjaer is without even winning anything, he will 100% fail regardless. Only Ole the Messiah can lead us to the promised land.
These are all proven and verifiable facts by the Ole in club.