So?He won in Australia and Japan with teams the subject of a salary cap, so just couldn’t buy a league. Won an Asian cup with Australia. All of these results were coupled with acknowledgment that they played the best football in the league.
He has obviously been tested. There’s more to life than the premier league.
It's all comparable to non league football compared to the PL.
He'd have the same trouble in most of Europe's top leagues with anyone who isn’t the dominant team there.
Look at the W/L/D column in the La Liga table from 6th down. They all beat eachother as they all fight equally. It's only the top few teams that pull ahead. Same for most elite leagues nowadays.