While the Vegas Golden Knights are a new NHL team, they could make it to the playoffs. If they use their depth and cap situation properly, they could become a surprisingly good team.
Also, this is all hypothetical. I do not believe that Vegas would make these type of moves nor do I believe that they want to be competitive at the moment.
Building your team from the draft has been proven to be the best way to grow a team and I believe that Vegas will be going down that route.
Depth
Vegas does not have a superstar forward or a number one defenceman.