can you prove this in any way shape or form. NO you don't know, you are debating a point on sheer speculation with no basis in fact whatsover. How in hell do you know a different manager wouldn't of bought players just as good? how do you know another manager might not have assembled a better squad for less quicker than 10 years? how do you know another manager wouldn't have won anything? answers on a postcard please.
Who have you got in mind? They all start with the same basics.. A squad and a budget,
Moyes had a poor squad and virtually no budget when he started.
Surely, since he had no massive budget to influence things, you can therefore compare him to everyone else who's started with a low budget low qauality team in the last 10 years.. Therefore the list of managers who have started similar and acheived the criteria you mentioned must logically be the ones that are better.
Who has started with a poor squad, no money and created a better squad than
Moyes, cheaper, in less time and won things?
Make a list and you have your answer as to which other premiership managers would be better than Moyes for our club.