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With United regaining top spot on the ladder, Kosmina said his backmen are proving to be the highlight of the season so far for Adelaide.
“Defensively we’ve been good,” Kosmina said.
“As much as we’ve turned the ball over at times in front of the defence, those guys have done their job,” he said.
The Reds have already bettered their clean sheet record from last season by keeping their fourth, just seven games into the 2012/13 Hyundai A-League season.
Last night’s win means Adelaide are off to the best start to a season since the 2005/06 season and Kosmina said there are similar traits the two squads share.
“The similar feeling is you feel confident going into games,” Kosmina said.
“I don’t want to curse myself either, I still think we’ve got a long way to go.
“We’ve got a long way to go to get to where I think the players in this team are capable of getting.
There’s a long way to go to achieve what they’re capable of achieving, as individuals and as a group,” he said.
“It's a disappointing loss because we gave them the game,” Aloisi said.
“After they scored the goal, we stopped playing - we stopped moving, stopped competing, and that’s the thing I'm disappointed about.
“You can go a goal down but you can't stop playing. We made that mistake and then it was all over.
“It's not physical ... it was more mental, it has to be.
“It was more mental and I'm not happy about it and I have to make sure that it doesn't happen again,” he said.
Aloisi believes the challenge for starting berths will fire his players up and give them a competitive edge on match-day.
“Once I have a full squad there will be competition for places,” Aloisi said.
“When you have a full squad you can make it even more competitive so the players have to fight for their place even more,” he said.