That just means some mugs have bet on him.
For every outlier like he has beaten Liverpool, Spurs and a 10 man Man City that are protecting themselves from injury, there are many more going the other way, like for example he did not beat any of the relegated teams in 6 matches, and lost to 2 of them.
At the moment I see Potter as a manager that has been bettered by Cooper at Swansea, and has not improved Brighton's results since Hughton. That isn't the CV of someone that deserves a shot at one of the Top 20 clubs in the world in my view.
Swansea fans loved Potter and were gutted when he left, here's their thoughts on what Cooper has done with what he inherited:
From the Planet Swans forum about Cooper,
"My personal beef has been about the quality of our play & seeming lack of progress in our style, I appreciate the club is in the results business rather than the entertainment version but we have become barely watchable recently - feels like the financial benefit in promotion is the target rather than the sporting/style/achievement, IF (& that’s a big one) we were to make it up I’d expect a minimal spend WBA style plan on coming straight back down & look to utilise the media money to establish financial security (maybe even a sale) rather than sporting success."
"Cooper is a hard guy to like. He's prickly, slow to learn and keen to allocate blame but not accept it. His team has consistently played slow, cautious, boring, largely direct football for his entire tenure. We've become a club that grinds points out via attrition rather than winning them in style. It's unustainable in the long run, and the idea of trying to do it in the Prem is frankly terrifying.
Whilst he deserves credit for two playoff finishes in a row, I don't see a massive disconnect between that and wishing that he'd go about his business in a different way, or hoping that someone who can bring a bit of fun back to watching the Swans gets the job instead."
"I don’t think anyone loves Steve Cooper.
His football isn’t the most aesthetic, we had a few bright spells during games earlier in the season, but they are few and far between. He’s a difficult guy to take to and as Dr W says further down the thread is great at deflecting blame but taking credit."
"I don't much like Cooper. I don't like the way he manages my side, I don't like the football he plays and I don't much like what I've seen of him as a person. I'll shed not a single tear on the day he departs. But it's frankly mad to suggest that we've achieved the playoffs in consecutive seasons despite him."
"I don’t know where you’re getting this ‘love’ for him from. No one on here likes the style of football, no one finds him engaging or charismatic, I doubt anyone is impressed by the way he blames players for defeats.
It’s pretty much split between those who give him credit for the results he’s got in spite of all the above and those who can’t wait for him to leave the club."
"He has fantastic contacts and we have players who would have been highly unlikely to come here without him and this has probably led to our league position which ultimately could lead to us winning the playoffs so for our club he has done a great job with the money that could potentially come in
As a fan however the football is basic and hard to watch and will only become harder next season should we go up"