Yes not that hard to work outLet me try and completely dumb it down for you
We gave Carlton 3 picks to get Gibbs and two picks.
We received 2 picks from Melbourne, but gave them 2 picks along with Lever.
Even on a completely basic level it suggests that by giving up 3 picks we paid more for Gibbs than we received for Lever.
Then when you weigh in the actual draft picks in terms of their relative values that measure also suggests that we paid more for Gibbs than we received for Lever.
It doesn't matter how much spin doctoring you try and apply to the relative trades, every conceivable measure suggests that we paid more for Gibbs.