I honestly think he needs to prove himself in the prem before that jump. Ange should be a lesson to top 6/8 teams in the prem - it takes a whole season to learn and adapt to the prem. It's a distinctly brutal competition, unique to the world. There's never a perfect prediction, but being able to do well with a low//mid table team is a good test.
That or, of course, proving yourself in another top league in europe in addition to other accolades (say winning european cups/doing well in CL) can be a marker for predicted success.
Unfortunately, Ange had none of those markers. Had he gone to say a "Brighton", he would have been found out for his inflexibility and inability to adapt in the league.
You say all this; but Ange's passed the test in Season 1.
Season 2 was the disaster.