Yes McDavid could be the catalyst of the changes coming to the Oilers but we are also forgetting one thing here to, the Oilers are moving to there new rink in 1 season and I think thats the main reason why Katz is making changes. There will be under more pressure to win which could lead to mistakes on choosing UFA's and taking chances in trades. Its quite amazing how much the rink is already done, see video below.
https://youtu.be/nLuFFSKGARo