The issue I have is that Celtic have better players than the rest of the league, so it would be more comparable if Ange came to the this league to manage Manchester City.
Put it like this, would he have won anything in Scotland had he been the manager of a team like Hearts?
Quite possibly.
When he took over Roar, they were cannon fodder for the better teams in their league. Until Ange rocked up, they'd never won the title in their history. He then won 2 on the bounce. They won 1 more after he left, with the team that he built, but since then they've reverted to type.
He won 2 titles with South Melbourne , who now ply their trade as a semi pro outfit. Before he turned up they'd never won anything of note in Oz.
At Yokohama, he took a mid table side, that hadn't won a title in over 15 years, and made them champions in 1 season.
With Australia, he took a team that again was really just making up the numbers, and made them Asian Champions.
With all of the above, he took in teams that had no spending advantage over their peers so, whilst he may have bought in players to complement his style, he didn't outspend any other team. Internationally, he used the same players that previous managers used and improved them immeasurably. He's done that everywhere he's been. So, whilst he may not have taken someone like Hearts to the title, as both Celtic and Rangers can outspend them, it's not a left field suggestion that he could have and, based on his previous history, would have.
Now this may not translate to the EPL, but there's enough prior evidence to suggest that it has every chance of succeeding. It's not as if Spurs are paupers, we've spent half a Billion quid over the last 4 years. So whilst we may not be able to match the spending of the likes of City, I don't think we need to under Ange. It's more about scouting and finding the right players, regardless of their status in the Football World. There are plenty on here who bleat about us missing out on talent before they get big with other teams, Mahrez and Kante being prime examples, and Ange has previous for unearthing gems.
As I see it, he only fails if he's not given time. I don't personally see him working within our budget as an issue, as he's used to that. So unless he suddenly goes completely 180 degrees and demands elite players, he'll unearth them instead.
And, if course, he'll have them playing a brand of Football that well all look forward to rather than dread.