Have you not realised Emery's record with a Sevilla team and a Valencia team with relatively little amounts of money, while selling key players every year.
He's had to deal with the likes of Silva, Villa, Mata going and he still kept Valencia in the top 3. He's had to deal with selling Rakitic, Negredo, Navas, Vidal, Bacca at Sevilla and he's got them CL football.
He won Europa league two years in a row and got Sevilla 5th(only a few points off a Valencia team with a lot of money and Atlético who reached the CL final). He is far from a cup manager and considering the constraints he's been under(which is way more than Brendan who's been spending circa 70M every season) clearly he is more than the 'cup manager' that you believe him to be. It's frankly unfair to compare him to Brendan who has basically struggled to cope with the absence of 2 players and an injury to another despite spending large amounts of money to replace them.