The team result without Campbell was a one goal Game 7 Stanley Cup Final. Despite all professing their friendship for Campbell the team moved past it and as Connor implores 'dig in'.
You have a better read on Skinner's character and work ethic than I do. I don't live in Edmonton so I don't have ability to monitor player's off-season training or skill development. Will venture it's not apathy or indifference that get players to the apex level of competition. Skinner was a mid-level prospect that beat the odds to make the NHL. He's the only guy in a bad organizational strategy to burn like 9 mid-round picks over a decade hoping to find NHL goaltending. Frankly I'm amazed the guy didn't meltdown like Campbell did under the circumstances
But again to point, McDavid and Draisaitl have immense influence on this team and, if they didn't think Skinner was the answer, it could have been a requirement to upgrade the position, if as you've asserted for other players that the two moneymakers have and use their influence for player personnel decisions.
This team isn't outscoring their problems including below average, developing goaltender. It's also not helping themselves with inconsistent own zone defending notably odd-man rushes against, poor net front defending and weak side coverage support. Last night all of this year's team's challenges were on display. Magnified by the play speed and efficiency of a team playing with a $15 million dead cap hit.