Why is it that Good Ebening is so outrageously successful in European competition?
It's a bizarre one, isn't it?
He always seems to perform exceptionally well in Europe, but his teams underperform in their domestic league.
Villarreal are currently 8 points off a European spot in La Liga, so they're essentially throwing all their eggs into the CL basket right now. Should they get knocked out against Liverpool, they may well not be in any European competition next year.
He had a similar sort of issue at Sevilla (albeit not to the same degree), where they never finished in the CL spots once, and particularly in his last season, where Sevilla never won away from home, yet he still won them the Europa League. From what I read, Sevilla fans got quite frustrated with their inconsistency.
He's not someone who knows how to effectively balance out multiple competitions. I think this is fine if you are club (with all due respect) like Villarreal. But it also shows (partially) why he struggled at Arsenal.
Emery is great when he has a hard working team who buy into his system, but if not, it all unravels. And I don't think it's a coincidence that pretty much all his successful tenures have been in Spain (Valencia, Sevilla and Villarreal).